(a) The cycle time of a microprocessor is the time for one complete clock cycle. For example, if the clock frequency of a microprocessor is 2 million cycles per second (2 MHz), then each cycle takes 500 ns (500 billionths of a second). Compare the cycle time of a microprocessor running at 2 MHz with one running at 50 MHz, 500 MHz, and 2 GHz. (b) If a certain 80 times 86 instruction requires four clock cycles to execute, how long does the instruction take to execute if the processor clock speed is 25 MHz? Repeat for a clock speed of 800 MHz