A stack can $be$ used $to$ check whether a given expression has balanced parentheses $or$ not. $An$ expression $is$ parsed from left $to$ right. When parsing, $if$ you see $an$ open parenthesis, push $it$ into the stack. $If$ you see a close parenthesis, pop the top element $(ifit$ exists$)$ from the stack. After you have parsed all characters $in$ the expression, check the stack. $An$ empty stack means that the parenthesis match, a non$-$empty stack means parenthesis $do$ not match. Which $of$ the following will result $in$ the non$-$empty stack?

$(1+2)(3+4)$

$\frac{15}{5}(3+4)6$

$(43+(1+2))5$

$(5+35)+(36)$