Assume a two-dimensional array called num is declared to hold four rows and seven columns. Which of the following statements correctly assigns the value 100 to the third physical column of each row?

a. for (x = 0; x < 3; ++x) num [x, 2] = 100

b. for (x = 0; x < 4; ++x) num [x, 2] = 100;

c. for (x = 1; x < 4; ++x) num [x, 2] = 100;

d. for (x = 1; x < 5; ++x) num [x, 2] = 100;

e. none of the above