Which of These Statements Is/are  True

Multiple Choice

Which of these statements is/are  true ?
I. As wavelength increases, frequency decreases.
II. As energy increases, frequency decreases.
III. As wavelength increases, energy decreases.
IV. The product of wavelength and frequency is constant.

A) I, III, and IV
B) I and II
C) I, II, and IV
D) III and IV
E) II, III, and IV