Consider the following ARM Assembly: fn_asm: add r1, r0, r1 bx lr Consider the following C code: #include extern int fn_asm(int a, int b); int main(int argc, char *argv[]) { printf("%d ", fn_asm(5,8)); return 0; } a. What is the output of the function main? b. Is there a benefit to using Assembly vs. C in this example c. Describe the function of bx lr.