Which of these is a wrong expression for the total circulation around a thin symmetric airfoil?

Γ=cαV∞\(\int_0^{\pi }\)(1+cosθ)dθ

Γ=\(\frac {c}{2} \int_0^{\pi }\)γ(θ)sin⁡θ dθ

Γ=cαV∞\(\int_0^c\)(1+cosθ)dθ

Γ=cαV∞\(\int_0^{\pi }\)(1+cosθ)dθ

Which of these is a wrong expression for the total circulation around

1.	Which of these is a wrong expression for the total circulation around a thin symmetric airfoil?
A.	Γ=\(\int_0^c\)γ(ξ)dξ
B.	Γ=\(\frac {c}{2} \int_0^{\pi }\)γ(θ)sin⁡θ dθ
C.	Γ=cαV∞\(\int_0^c\)(1+cosθ)dθ
D.	Γ=cαV∞\(\int_0^{\pi }\)(1+cosθ)dθ
Answer» D. Γ=cαV∞\(\int_0^{\pi }\)(1+cosθ)dθ