1.5 Consider three different processors P1, P2, and P3 executing the same instruction set. P1 has a 2 GHz clock rate and a CPI of 1.5. P2 has 3.5 GHz clock rate and a CPI of 2. P3 has a 4.0 GHz clock rate and has a CPI of 2.5. 1. Which processor has the highest performance expressed in instruction per second? 2. If the processors each execute a program in 15 seconds, find the number of cycles and the number of instructions. 3. We are trying to reduce the execution time by 30% but this leads to an increase of 20% in the CPI. What clock rate should we have to get this time reduction