The property of transactions that ensures either all the operations in a transaction are completed successfully, or none of them are applied to the database is called atomicity. Atomicity guarantees that transactions are indivisible and all-or-nothing; either all the operations within a transaction are successfully completed and committed, or none of them are applied, preserving the consistency and integrity of the database.

The correct answer is option 2, "json". The encoding/json package in Go provides functions for encoding and decoding JSON data. It is commonly used for working with JSON data in Go programs.

In Go, you append elements to a slice using the append function. The syntax is append(slice, element), where slice is the slice you want to append to, and element is the element you want to append.

In the database/sql package of Go, the interface used to represent a database row is Row. This interface provides methods to scan column values into Go variables. When executing a SQL query that returns rows, you typically use the QueryRow() method to fetch a single row and then scan its values using the Scan() method of the Row interface. The Row interface abstracts the notion of a database row, making it easy to work with individual rows of query results.

In Go, the defer keyword is used to defer the execution of a function until the surrounding function returns. It's commonly used to ensure cleanup actions are performed, such as closing files or unlocking mutexes.

In Go, the 'errors.New()' function is used to create custom error messages. This function takes a string as input and returns a new error that implements the 'error' interface. It's commonly used when a specific error message needs to be returned from a function.

Channels in Go can be synchronous or asynchronous and buffered or unbuffered. Synchronous channels block the sender until the receiver is ready, while asynchronous channels allow the sender to continue immediately. Buffered channels have a capacity, allowing multiple senders to store data without immediate consumption.

The correct option is registering a handler function for a specific route. http.HandleFunc is used to associate a handler function with a specific URL pattern. When a request matches the specified pattern, the associated handler function is called to handle the request.

Ginkgo is a popular testing framework in Go that enables developers to write behavior-driven tests using a natural language style. It provides clear and readable test cases, enhancing the readability of tests.

Trying to send data to a closed channel in Go results in a panic. This is because sending data to a closed channel is not allowed and will cause a runtime panic, terminating the program.

In Go, the keyword "func" is used to define a function. It precedes the function name and parameter list in a function declaration. For example, func functionName(parameters) returnType { ... }.

GoConvey is a testing framework in Go that integrates seamlessly with popular continuous integration (CI) tools like Travis CI and Jenkins. Its integration capabilities make it easier to incorporate automated testing into the CI/CD pipeline, ensuring that tests are run consistently with each code change.