$9.[10]$ Refer to the following table when answering the questions given below. Computers A and B have the same ISA, but have different implementations. Computer A Computer B Clock Frequency $2\mathrm{.}4$ GHz $3\mathrm{.}3$ GHz Program P$1$ CPI for Instruction Class C$14540\%$ CPI for Instruction Class C$23520\%$ CPI for Instruction Class C$34630\%$ CPI for Instruction Class C$43($a$)$ Calculate the CPIAVG for program P$1$ on each computer. $210\%($b$)$ For program P$1,$ determine which computer executes faster and by how much. $($c$)$ You want to improve the performance of computer A$.$ You found a method to half the CPI of an instruction class, but the method can be applied only to a single class. For which instruction class would this improvement have the greatest impact on the execution time $($ET$)$ of program P$1?$ How much improvement would this yield?