E4A05 - Amateur Extra Class

E4A05 : What is the purpose of using a prescaler with a frequency counter?
A Amplify low-level signals for more accurate counting
B Multiply a higher frequency signal so a low-frequency counter can display the operating frequency
C Prevent oscillation in a low-frequency counter circuit
D Reduce the signal frequency to within the counter's operating range
Correct Answer: Reduce the signal frequency to within the counter's operating range