When Does Chromatic Aberration Occur in a Telescope

Multiple Choice

When does chromatic aberration occur in a telescope?

A) when different colours of light do not focus at the same point in a reflecting telescope
B) when different colours of light do not focus at the same point in a refracting telescope
C) when light of different wavelengths gets absorbed by the mirror in a reflecting telescope
D) when light of different wavelengths gets absorbed by the lens in a refracting telescope