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Which of these is not an assumption made while formulating momentum theory for hover and clib of a helicopter?

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Which of these is not an assumption made while formulating momentum theory for hover and clib of a helicopter?

(a) Blade is modeled as an actuator disk

(b) Non-uniform loading over the disk

(c) Smooth slipstream

(d) Slipstream rotation velocity is negligible

I have been asked this question in unit test.

I want to ask this question from Momentum Theory topic in portion Helicopter Dynamics of Aerodynamics

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The correct choice is (b) Non-uniform loading over the disk

Easy explanation: There are various assumptions made while formulating the momentum theory for the helicopter in hover and climb condition. These are-the blades are modeled to be a thin circular actuator disk, there is uniform loading over the disk, the slipstream is well defined, the rotational velocity in the slipstream is neglected and there is uniform induced velocity.

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