4. [15] The datpath diagram shown in Figure 4.24 is for a small subset of MIPS instructions. If we wish to add support for the following MIPS instructions, is it necessary to make any changes to the datapath? If so, describe what changes (expanded MUXes, additional hardware additional control points, etc.) are needed (a) ori (b) jal (Recall that jal jumps to an address and sets $r31 equal to PC+4.)