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How drag is formed on the cylinder?

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in Aerodynamics by (773k points)
How drag is formed on the cylinder?

(a) Due to viscous effect

(b) Due to friction

(c) Due to boundary layer

(d) Due to surface layer

I had been asked this question in quiz.

My enquiry is from Lifting Flow over Cylinder topic in chapter Inviscid & Incompressible Flow of Aerodynamics

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Correct choice is (a) Due to viscous effect

The explanation: Drag is due to a viscous effect, which generate a frictional shear stress at the body surface and which causes the flow to separate from the surface on the back of the body. At the leading edge of the cylinder, a stagnation point is formed. Where the oncoming flow is brought to rest. The pressure here is equal to the stagnation pressure. At the adjacent to the cylinder surface, a thin boundary layer is formed. Which causes the drag on the cylinder.

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