You study three processors X1, X2, X3 which use the same assembly language (instruction set architecture), but different clock rates. X2 is the fastest with 3.4 GHz clock, X1 has a 2 GHz clock, while the clock of X3 has a frequency of 1.6 GHz. Their CPI is also different, with X1 having a CPI =2 cycles/instructions, X2 CPI is 4 cycles/instruction and X3 has a CPI of 1.4. 1) If you consider that CPU Performance is number of instructions executed/second then which of X1, X2 or X3 is the most performant? 2) Each of the processors executes the same app for 8 seconds, some finish it, some not. In this time how many cycles did each processor clock run? 3) How many instructions did each of the three processors execute in the 8 seconds