(30 points) Pseudo-instructions: Show how to implement the following pseudo-instructions as they would be implemented in a real machine (e.g., using $at). Run your code in MARS and upload the assembly file. 1. nop # Do nothing (show three different ways) 2. li $s0, <32-bit constant> # Load 32-bit immediate value into so 3. div $s0, $s1, $s2 # Integer division: s0 = s1/s2