The dimensions of a four-link mechanism are: AB = 400 mm, BC = 600 mm, CD = 500 mm, DA = 900 mm, and ∠DAB = 60°. DA is the fixed link. E is a point on the link BC such that BE = 400 mm and CE = 300 mm (with ∠BEC being clockwise). A force of 150 N acts on DC at a distance of 250 mm from D. Another force of magnitude 100 N acts at point E. Find the required input torque on the link AB for static equilibrium of the mechanism. [4.6 N·m clockwise]