The stack pop operation

removes from the stack the number of elements specified by its integer parameter

removes all items currently on the stack

extracts one element from the stack and returns it

does not exist: There is no such stack operation

extracts one element from the stack and returns it

Explanation:

Basically,  a stack is an abstract data type that serves as a collection of elements. It has two principal operations:

push, which adds an element to the collection, and

pop, removes an element from the Stack and returns the removed element  This operation is often found in c and java programming.

Therefore, the correct option in our case is that the stack pop operation extracts one element from the stack and returns it.

1. b

2. c

3. b

4. a

5. b