What is a recursive function?A function that calls other function.A function which calls itself.Both A and BNone of the above

Understanding Recursive Functions

A recursive function is defined as a function that calls itself in order to solve smaller instances of the same problem. This self-referential behavior allows complex problems to be broken down into simpler sub-problems, which are easier to solve. Let’s analyze the given options:

1. A function that calls other functions: This statement is not specifically describing a recursive function because it could refer to any function that calls other functions, but does not imply self-reference.

2. A function which calls itself: This directly describes a recursive function because it emphasizes that the function invokes itself to perform its tasks.

3. Both A and B: Since statement A does not strictly define a recursive function, this option cannot be correct.

4. None of the above: This option is incorrect as option B adequately defines a recursive function.

Conclusion

Therefore, the correct answer is B: A function which calls itself. This option captures the essence of what constitutes a recursive function in programming and mathematics.