Which of the following structures is used to handle errors in Python?

In Python, error handling is primarily facilitated through the use of the try-except structure, and the correct option incorporates additional components that enhance error management.

The try-except-else-finally structure allows for comprehensive error handling. Within a try block, code execution is attempted, and if any exceptions occur, control passes to the corresponding except block, which is specifically designed to handle those exceptions. If no exceptions are raised within the try block, the code within the else block will execute, providing a way to run code that should only happen if no errors occur.

Finally, the finally block is used to define a section of code that will execute regardless of whether an exception was raised or not. This is particularly useful for cleaning up resources, such as file handles or network connections, ensuring that necessary cleanup occurs even if an error interferes with execution.

This structure is vital for robust programming as it gives developers a means to anticipate, manage, and respond to potential errors gracefully, improving the stability and reliability of applications.