Which of the following is a key advantage of using functions in programming?

Using functions in programming primarily promotes code reusability, which is a significant advantage. When a function is defined, it encapsulates a particular task or set of instructions that can be reused throughout the program. This means that instead of rewriting the same code multiple times for similar tasks, a programmer can simply call the function whenever needed. This not only saves time and effort but also simplifies the code, making it easier to maintain and manage.

Furthermore, functions can be tested and debugged separately from the main code, leading to fewer repeat errors and a more robust program overall. The ability to reuse code also aids in collaboration among programmers, as shared functions can be included in different projects without starting from scratch. Overall, the modular approach that functions provide enhances code organization and efficiency.