Which of these is the continuity equation for an axisymmetric flow?

• A. ρVθcot⁡θ + ρ\(\frac {∂(V_θ)}{∂θ}\) + Vθ\(\frac {∂(ρ)}{∂θ}\) = 0
• B. 2ρVr + ρVθcot⁡θ + ρ\(\frac {∂(V_θ)}{∂θ}\) + Vθ\(\frac {∂(ρ)}{∂θ}\) = 0
• C. 2ρVr + ρVθcot⁡θ = 0
• D. \(\frac {1}{r{^2}} \frac {∂}{∂r}\) (r2ρVr) + \(\frac {1}{r sinθ} \frac {∂}{∂θ}\)(ρVθsin⁡θ) + \(\frac {1}{r sinθ} \frac {∂(ρV_ϕ)}{∂ϕ}\) = 0