If N is 4 and m is the matrix displayed below, which code fragment below stores 1's along m's main diagonal and leaves all other entries unchanged?
```
m 0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
```
a. for ( int i = 1; i < N; ++i )
for ( int j = i; j <= N; ++j )
m[i][j] = 1;
b. for ( int i = 1; i < N; ++i )
m[i][i] = 1;
c. for ( int i = 0; i < N; ++i )
for ( int j = i; j <= N; ++j )
m[i][j] = 1;
d. for ( int i = 0; i < N; ++i )
m[i][i] = 1;
d. for ( int i = 0; i < N; ++i )
m[i][i] = 1;
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