Correct option is D
A crystal oscillator is the most stable frequency oscillator which is based on piezoelectric effect.
The most common material for crystals oscillator is quartz.
Advantage of crystal oscillator:-
It is possible to obtain a very high precise and stable frequency of oscillator.
It has very-low-frequency drift due to change in temperature and other parameter.
Its Q is very high (Q = quality factor).
It has automatic amplitude control.
