After you run the code below, what is the value of mat[5][4]?

19.)

int[][] mat = new int[12][12];

for(int r = 0; r < mat.length; r++ ){

for(int c = 0; c <= r; c++ ){

if(c == 0 || r == 0)

mat[r][c] = 1;

else

mat[r][c] = mat[r-1][c] + mat[r-1][c-1];

}

}

a.) 1

b.) 5

c.) 10

d.) 6

e.) 15