A computer with a 3.64 GHz processor means that it can execute 3.64 billion instructions per second. The term GHz (gigahertz) refers to the clock speed of the processor, indicating how many cycles (or instructions) it can perform in one second. Specifically, 1 GHz equals 1 billion cycles per second, so a 3.64 GHz processor can perform approximately 3.64 billion cycles or instructions per second.
The other options provided do not accurately describe what a GHz measurement indicates.