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For momentum theory analysis, what is rotor modelled as?

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For momentum theory analysis, what is rotor modelled as?

(a) Thin actuator disk

(b) Thick actuator disk

(c) Angled blade

(d) Two dimensional airfoil

I had been asked this question in homework.

The query is from Momentum Theory topic in chapter Helicopter Dynamics of Aerodynamics

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Right answer is (a) Thin actuator disk

Explanation: For conduction momentum theory analysis of the rotor, it is modeled as an actuator disk. It is considered to be thin circular disk of negligible thickness which can support pressure difference and accelerate air. This works as an approximate.

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