正解:A
Functions in programming are a fundamental concept that provide several key benefits:
* Modularity: By breaking down a program into smaller, manageable functions, it becomes easier to understand, debug, and maintain.
* Reusability: Functions allow code to be reused across the program, reducing redundancy.
* Abstraction: Functions can abstract complex operations into a simple function call, making the code easier to read and understand.
* Testing: Functions can be tested individually, which simplifies the process of testing the overall program.
Reference: Cisco DevNet Associate Certification Guide, Chapter on Python Programming and Software Development .