High
Low
Very low
None of the mentioned
Answer is Right!
Answer is Wrong!
The correct answer is: A. High
CMOS inverters have high input resistance because they use MOSFETs as the switching elements. MOSFETs are voltage-controlled devices, which means that the current flowing through them is controlled by the voltage applied to the gate. This means that the input resistance of a CMOS inverter is very high, since very little current flows into the gate when the input voltage is high or low.
Option B is incorrect because CMOS inverters do not have low input resistance. Option C is incorrect because CMOS inverters do not have very low input resistance. Option D is incorrect because CMOS inverters do have high input resistance.