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How many extra stress terms occur due to the LES filtering operation?

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How many extra stress terms occur due to the LES filtering operation?

(a) No extra terms

(b) Four terms

(c) Three terms

(d) Two terms

I had been asked this question during an interview.

I want to ask this question from Turbulence Modelling in chapter Turbulence Modelling of Computational Fluid Dynamics

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The correct answer is (c) Three terms

The explanation is: The LES filtering operation resolves the flow variables into two – the filtered one and the unresolved spatial variations. This resolution leads to three extra stress terms. They are collectively called as Sub-Grid-Scale stresses.

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