The correct answer is (C), (D), (A), (B)Speed of processor is measured by the clock speed. The clock speed measures the number of cycles your CPU executes per second, measured in GHz (gigahertz). A €œcycle€ is technically a pulse synchronized by an internal oscillator, but for our purposes, they're a basic unit that helps understand a CPU's speedFollowing is the list of intel processors with its clocks speedProcessorClock Speed80486(1989 €“ 1992)25 MHz - 100 MHz8085 (1976)3 MHzDual Core(2006 €“ 2009)1. 6 GHz - 2. 93 GHzPentium-III(1999 €“ 2003)450 MHz - 1. 4 GHzHence we can conclude that correct answer is (C), (D), (A), (B)