What is the difference between an "increase in demand" and an "increase in quantity demanded"?

A) There is no difference between the two terms; they both refer to a shift of the demand curve.
B) An "increase in demand" is represented by a rightward shift of the demand curve while an "increase in quantity demanded" is represented by a movement along a given demand curve.
C) There is no difference between the two terms; they both refer to a movement downward along a given demand curve.
D) An "increase in demand" is represented by a movement along a given demand curve, while an "increase in quantity demanded" is represented by a rightward shift of the demand curve