pls help

A c-function with prototype: int op_calc (uint8_top, int16_ta, int16_t b); is disassembled as shown below. If a = 0x1234, b = 0x5678, and op = 0, then the return value of the function is given by: Ox ; int op_calc (uint8_top, int16_ta, int16_t b) { c-function MOV r3,ro CBZ r3,OPO ; Compare and Branch on Zero CMP r3,#0x01 BEQ OP1 CMP r3,#0x02 BNE BYE B OP2 ADDS ro,r1,r2 B BYE SUBS ro,r1,r2 B BYE MUL ro,r1,r2 NOP NOP BX Ir ;3 A