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What is the physical meaning of divergence of velocity?

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What is the physical meaning of divergence of velocity?

(a) Time rate of change of the volume per unit volume

(b) Time rate of change of the volume of a moving fluid element per unit volume

(c) Time rate of change of the volume

(d) Time rate of change of the volume of a moving fluid element

The question was asked during an online interview.

The above asked question is from Governing Equations in portion Governing Equations of Fluid Dynamics of Computational Fluid Dynamics

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The correct option is (b) Time rate of change of the volume of a moving fluid element per unit volume

To explain I would say: Divergence of velocity of a moving fluid model physically means that “time rate of change of the volume of a moving fluid element per unit volume”.

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