22. Which is the following is an equivalent MIPS ISA code for the following MIPS machine code given in hex digits, 01294020? a. addi $9, $9,4 //addi's op-code is 34 b. lw $9, 4($9) //sw's op-code is 35 c. add $8,$9, $9 //add's fn-code is 32 d. sub $8,$9, $9 //sub's fn-code is 36