sw t0, 0(St1) Q4. (5 marks) : There are 32 registers in MIPS register file and around 50 instructions in current MIPS-32 instruction set. Assume that we would like to expand the MIPS register file to 128 registers and expand the instruction set to contain four times as many instructions. a) How would this affect the size of each of the bit fields in the 32-bit R-type instructions? (note: any arrangement for shamt and func field is allowed) b) How this would this affect the size of each of the bit fields in the 32-bit I-type instructions