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 $\quad$ #include <iostream>
2 $\quad$ using namespace std;
3
4 $\quad$ int main()
5 $\quad$ {
6 $\quad$$\quad$ const int MY_VAL = 77;
7 $\quad$$\quad$ MY_VAL = 99;
8 $\quad$$\quad$ cout << MY_VAL << endl;
9 $\quad$$\quad$ return 0;
10 $\quad$ }

A) 6
B) 8
C) 9
D) 7