Given that the area of a rhombus is 40 cm² and that each side is of length 15 cm, calculate the angles of the rhombus.

A) 60°, 120°, 60°, 120°
B) 45°, 135°, 45°, 135°
C) 30°, 150°, 30°, 150°
D) 90°, 90°, 90°, 90°