1. Annotate the following MIPS instructions to indicate source registers and destination registers. A source register is read during the instruction's execution, while a destination register is written during the instruction's execution. (12 points) 1. add $t4,$t2,$t1 2. sub $t3,$zero,$t4 3. addi $t4,$t3,100 4. Iw $s2,4($gp) 5. sw $s2,8($gp) 6. bne \$t4, \$s2, loop1