How do dew point and relative humidity change with decreasing temperature?

Question

Question PPL(A) - Private Pilot License - Meteorology

QuizVDS · Accepted Answer

Dew point remains constant, relative humidity increases

QuizVDS · Answer

Dew point remains constant, relative humidity decreases

QuizVDS · Answer

Dew point decreases, relative humidity increases

QuizVDS · Answer

Dew point increases, relative humidity decreases

Id 44 - PPL(A) EN - How do dew point and relative humidity change with decreasing temperature?