What is a sub-procedure in programming?

A sub-procedure in programming refers to a section of code that is defined in one location and can be invoked from multiple places within a program. This concept is foundational in promoting code reuse, modularity, and organization in programming. By defining a sub-procedure once, several parts of a program can leverage its functionality without duplicating code, leading to easier maintenance and reducing the likelihood of errors.

The option concerning a section of code stored once for multiple uses accurately encapsulates this idea, as it emphasizes the efficiency and utility of sub-procedures. Unlike having multiple copies of the same function, which could lead to inconsistencies and increased complexity, a single definition allows for consistent behavior and can be adjusted in one location if changes are needed.

In summary, a sub-procedure is an essential coding construct that allows for a single implementation of a block of code that can be reused throughout a program, enhancing readability and maintainability.