Translate the following C code to MIPS assembly code. Use a minimum number of instructions. Assume that the values of a, b, i, and j are in registers $S0, $S1, $t0, and $t1, respectively. Also, assume that register $S2 holds the base address of the array D.

for (i = 0; i < a; i++)
for (j = 0; j < b; j++)
D[4*j] = i + j;