Question $4.(10$ points$)$ Effective CPIConsider the average frequencies for various instruction types:Instruction Types $\%$IC $($frequency$)$ CPIALU $43\%1$Load $21\%2$Store $12\%2$Branch $24\%2$a$).(5$pts$)$ Calculate the average CPI.b$).(5$pts$)$ Suppose we have a compiler that can optimize the program. The compiler can eliminate$50\%$ of the ALU instructions. With the optimized compiler, calculate the average CPI.