Consider these functions: push() : push an element into the stack pop() : pop the top-of-the-stack element top() : returns the item stored in top-of-the-stack-node What will be the output after performing these sequence of operations push(20); push(4); top(); pop(); pop(); pop(); push(5); top();

Consider these functions: push() : push an element into the stack po

1.	Consider these functions: push() : push an element into the stack pop() : pop the top-of-the-stack element top() : returns the item stored in top-of-the-stack-node What will be the output after performing these sequence of operations push(20); push(4); top(); pop(); pop(); pop(); push(5); top();
A.	20
B.	4
C.	stack underflow
D.	5
Answer» E.