All of the following can provide evidence of an economic event except

Public-key encryption was developed in the late ________.

A. 1950s B. 1970s C. 1960s D. 1980s

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;