Which Line in the Following Program Will Cause a Compiler $\quad$

Multiple Choice

Which line in the following program will cause a compiler error?
1 #include <iostream>
2 using namespace std;
3
4 int main()
5 {
6 $\quad$ const int MY_VAL = 77;
7 $\quad$ MY_VAL = 99;
8 $\quad$ cout << MY_VAL << endl;
9 $\quad$ return 0;
10 }

A) line 6
B) line 7
C) line 8
D) line 9
E) there will be no compiler error