Which of the Following Statements Regarding a Firm's Production Function

Which of the following statements regarding a firm's production function is true?

A) The marginal product of labour curve must not intersect the average product of labour curve.
B) The average product of labour curve intersects the marginal product of labour curve at its highest point.
C) The average product of labour curve intersects the marginal product of labour curve at its lowest point.
D) The marginal product of labour curve intersects the average product of labour curve at its lowest point.
E) The marginal product of labour curve intersects the average product of labour curve at its highest point.