An X-rays tube is operated at `66kV`. Then , in the continous spectrum of the emitted X-rays :
A. wavelengths `0.01`nm and `0.02`nm will both be absent
B. wavelengths `0.01 nm` and `0.02 nm` will both be absent
C. wavelengths `0.01 nm` will be present but wavelengths `0.02 nm` will be absent
D. wavelengths `0.01nm` will be absent but wavelength `0.02 nm` will be present
