4a. The following MIPS assembly code contains a mistake that violates the MIPS convention in terms of using stack for storing protecting registers. - What is the mistake and how should it be fixed? Comment the code where the error(s) are located and correct the corresponding lines in the code. - For the corrected code, sketch the stack frame contents at the time when the instruction move Ss1. Sal' is being executed. f: addi $sp,$sp, 12 sw $ra, 8($sp) sw $51, 4($sp) sw $50,($sp) move $50, $a0 move $51, $a1 # Stack frame? jalg add $v0, $v0, $50 lw $ra, 8($sp) lw $51, 4($sp) lw $50, ($sp) addi $sp,$sp, -12 jr $ra g: mul $v0, $50, $s1 jr Sra b. Write C/C++ functions int f0 and int go implementing the MIPS code from above. Assume that in the MIPS code, Sa0 and Sal are the input integer parameters to the function f and that both fand g are passing their return values via Svo