3. Write one or two short sentences to clearly explain the advantage of template functions? (10 points) 4. Complete the body of this function. You do not need to check the precondition. You may use the stack template class. (10 points) bool balanced (const char pl l, size t n) / Precondition: p[0]...p[n-1] contains n characters, each of which is C,,'or' II Postcondition: The function returns true if the characters form a sequence of correctly balanced parentheses with each ' matching a and each matching a Note that a sequence such as ( {) is NOT balanced because when we draw lines to match the parentheses to their partners, the lines cross each other. On the other hand, ( ) and ) 3 are both balanced