Mathematically, what is meant by Kelvin’s Circulation Theorem for an inviscid and incompressible flow? (For the same set of fluid elements moving in a closed curve along with the fluid).

• A. DΓ/Dt = 0
• B. γ1 ≥ Γ2, where 1 is the upstream direction
• C. Γ = -∮C1V.ds
• D. .a) DΓ/Dt = 0b) γ1 ≥ Γ2, where 1 is the upstream directionc) Γ = -∮C1V.dsd) Γ = 0