For an in-compressible flow field, V, which one of the

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For an in-compressible flow field, V, which one of the following conditions must be satisfied?

1. ∇ . V̄ = 0
2. ∇ × V̄ = 0
3. (V̄.∇) V̄ = 0
4. δV̄ (V̄.∇) V̄ = 0
  δt

Correct Option: A

In compressible flow condition
∇.v̄ = 0