The correct option is "branch." The command "git branch" is used to create a new branch in Git. This is a fundamental operation in Git for branching and managing different versions of a project. When you run "git branch" followed by the branch name, Git creates a new branch based on the current state of the repository.

The main drawback of FCFS is the High Average Waiting Time, as processes are executed in the order they arrive, leading to longer waiting times, especially for processes with shorter execution times but arrive later.

Agile is recommended for projects with evolving requirements due to its iterative and incremental approach. It allows for flexibility, constant feedback, and adaptation to changing needs, making it ideal for dynamic projects where requirements may evolve during development. Waterfall is a sequential model and may not be suitable as changes late in the process can be costly and time-consuming. Spiral and RAD also offer iterative approaches but are less suited for continuous requirement changes compared to Agile.

The CSS property used to change the background color of an element is background-color. This property specifies the background color of an element and can be set using color names, HEX codes, RGB values, or RGBA values, allowing for a wide range of color customization.

Using a message broker for asynchronous communication ensures reliability by decoupling services and enabling eventual consistency. It also helps in handling peaks in traffic and reducing dependencies, enhancing the overall reliability of the microservices architecture.

Django's ORM offers the advantage of abstracting database operations, making it easier to work with databases without writing raw SQL queries. However, this abstraction can lead to performance overhead, especially in complex queries or large datasets. Additionally, while the ORM simplifies common tasks, mastering its intricacies can require a significant learning curve for developers unfamiliar with ORM concepts.

The property in binary search trees that ensures all nodes in the left subtree have keys less than the node's own key, and all nodes in the right subtree have keys greater than the node's key is known as the order property. This property is fundamental to the functioning of binary search trees as it enables efficient searching by narrowing down the search space at each step based on the comparison of keys.

Git handles merge conflicts by marking them in the code and prompting the user for manual resolution. This involves reviewing the conflicting changes, choosing the correct versions, and then committing the resolved files back into the repository.

To center an element horizontally in CSS, you typically use the 'margin' property with a value of 'auto' on the element you want to center. This approach works for block-level elements by evenly distributing the remaining space on either side of the element. Using 'text-align: center' on the parent element only centers inline-level content inside it, not block-level elements. Padding and floating do not directly center elements horizontally; they serve different purposes in CSS layout. Understanding how to center elements is fundamental for creating visually appealing and well-structured web layouts.

A distributed database like Cassandra or MongoDB with sharding and replication is suitable for handling sudden traffic spikes as it can scale horizontally by adding more nodes. Sharding distributes data across multiple nodes, while replication ensures data availability and fault tolerance. A caching layer improves read performance but may not handle spikes in write operations efficiently. Message queues are used for asynchronous communication and may not directly address scalability. Load balancers distribute incoming traffic across multiple servers but do not inherently handle database scalability.