Consider (I)the Law of Reflection and (II)the Law of Refraction

Multiple Choice

Consider (I) the law of reflection and (II) the law of refraction.Huygens' principle can be used to derive:

A) only I
B) only II
C) both I and II
D) neither I nor II
E) the question is meaningless because Huygens' principle is for wave fronts whereas both I and II concern rays