10. A traveling wave on a string of linear density μ can be described by the wave function y(x, t) = A sin (Bx+ Ct+ D) where A, B, C, D are all positive constants. Which statement is not correct?. (A) wavelength (λ) =2 π /C；(B) velocity of the wave (U) = CIB ；(C) tension (F) = μC2/B2, (D) All； (E) None.