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A man is rowing a boat of mass \( m \) with a constant velocity \( v_{0} \) in a river. The contact area of boat is \( A \) and coefficient of viscosity is \( \eta \). The depth of river is \( D \) . Assume that velocity gradient is constant. The force required to row the boat is
(1) \( \frac{\eta A v_{0}}{2 D} \)
(2) \( \frac{2 \eta A v_{0}}{D} \)
(3) \( \frac{\eta A v_{0}}{D} \)
(4) \( \frac{3 \eta A v_{0}}{2 D} \)
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