b. add c) push peek 9- Given the following infix expression, which one of the following is the corresponding p expression? e. none of the above Using the evaluatePostfix algorithm, evaluate the following postfix expression. 72+4 10- (Note that the first operand is 7 and the second operand is 2). e 15 13 8. 36 h. 18 ollowing are short answer questions: 11- Suppose that s and t are empty stacks and a, b, c, and d are objects. What do t stacks contain after the following sequence of operations executes? s.push(a); b, c,d,a s push(b); a, c, d, b s,push(c); a, b, d,c t.push(d); t.push(s.pop)); t.push(s.peek0); s.push(t.pop)); t.pop()