(A) If operations given below is applied on a stack, what will be the result? (B) For array implementation we need is_full() operation, however in linked list case this function is not required....

(A) If operations given below is applied on a stack, what will be the result?

(B) For array implementation we need is_full() operation, however in linked list case this function is not required. Explain the reason

createStack()
push(1)
push(2)
push(1)
peek()
push(2)
pop()
pop()
pop()
push(2)
push(1)
push(2)