Processor speeds are given in hertz. one hertz refers to what?
a
one use of an input device

b
one fetch-decode-execute cycle

c
one transfer from binary to hexadecimal

It's B

Explanation:

The unit of measurement called a hertz (Hz), which is technically one cycle per second, is used to measure clock speed. In the case of computer clock speed, one hertz equals one tick per second. The clock speed of computers is usually measured in megahertz (MHz) or gigahertz (GHz).

building and maintaining the topology is difficult and time consuming. the chance of redundant connections is high, which adds to the high costs and potential for reduced efficiency.

explanation: