2.18 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. 2.18.1 [5] How this would this affect the size of each of the bit fields in the R-type instructions? 2.18.2 [5] How this would this affect the size of each of the bit fields in the I-type instructions? 2.18.3 [5] How could each of the two proposed changes decrease the size of an MIPS assembly program? On the other hand, how could the proposed change increase the size of an MIPS assembly program