Choose the MIPS codes that translate for the following C statement and do not use any psuedoinstruction.
s2 = s1 - 7;
A: subi s2, s1, 7
B: addi s2, s1, -7
C: addi 1, 0, 7, sub s2, s1, 1
D: addi 1, 0, -7, add s2, s1, 1