The correct option is "c) diff." The git diff command is used to show the changes between the working directory and the specified commit. It provides a line-by-line comparison of what was added, modified, or deleted.

To update a Git Submodule to the latest commit in its repository, you use the command git submodule update --remote. This command fetches the latest changes from the submodule's repository and updates the working directory to the new commit.

Git is primarily used as a Version Control System in DevOps practices to track changes, collaborate, and maintain a history of codebase modifications.

The primary purpose of a version control system, like Git, is to track changes in code and manage different versions of files. It allows developers to collaborate, review changes, and revert to previous versions if needed.

The merge algorithm in C++ STL is used to merge two sorted ranges into a single, sorted range. Both input ranges should be sorted for the merge algorithm to work correctly.

In C++, the addition of two floating-point numbers (like 5.5 and 2.5) will result in another floating-point number, which is 8.0 in this case.

The C++ STL provides several types of iterators like random access, bidirectional, and forward iterators. However, there is no iterator type named "Dynamic." Iterators are powerful tools in STL, allowing operations like traversal, reading, and writing to elements of container objects.

A function signature in C++ is determined by its name and its parameter list. The return type is not considered a part of the function's signature.

A friend function can indeed be a member function of another class. In this context, one class allows a member function of another class to access its private and protected members by declaring that member function as a friend.

Enums, short for enumerations, allow the definition of a type that can hold a set of integral constants. They provide a way to assign names to the integral constants which makes the code more readable and maintainable.