What does the term $$GHz$$ mean?

Option

Processor speed is measured in gigahertz, or GHz$,$ which refers to the number of machine cycles per second that the processor goes through. So$,$ for example, a $3$ GHz processor performs $3$ billion machine cycles per second.

Option

Processor speed is measured in gigahertz, or GHz$,$ which refers to the speed with which the CPU fetches data or instructions from RAM. So$,$ for example, a $3$ GHz processor performs $3$ billion program instructions per second.

Option

Processor speed is measured in gigahertz, or GHz$,$ which refers to the speed with which the CPU can decode instructions into something the computer can understand. So$,$ for example, a $3$ GHz processor decodes $3$ billion program instructions per second.

Option

Processor speed is measured in the number of programs in the system cycle. So$,$ for example, a $3$ GHz processor performs $3$ billion machine cycles per second.