For each of these C functions, specify the ARM7 register(s) in which each argument is passed and result is returned. a. uint32_t fn4(uint16_t a, uint32_t b, int8_t c, uint32_t d) a is passed in: b is passed in: c is passed in: d is passed in: the result is returned in:b. uint64_t fn2(uint64_t a, uint64_t b) a is passed in: b is passed in: the result is returned in: