2) Examine the C+ source code given in the following two questions. Trace the programs and write down the exact output that would be displayed when the programs run. Your answers should be written into the given box next to the each program source code. (25 Points) 2.1 (15 pts) #include using namespace std; int main)( //please write your answer to this box int a-1, b-2, c 3, d-4, x-e; x a+b+c+d; cout