Consider you have a stack whose elements in it are as follows.
5 4 3 2 << top
Where the top element is 2.
You need to get the following stack
6 5 4 3 2 << top
The operations that needed to be performed are (You can perform only push and pop):

A. Push(pop()), push(6), push(pop())

B. Push(pop()), push(6)

C. Push(pop()), push(pop()), push(6)

D. Push(6)

Answer: Option A