15．Consider the Schrödinger Equation for the time-dependent state vector ψ(x,t) of a system︰=Hψ (x,t).Assume we can find a funcition ψE(x) such that it is an eigenstate to the Hamiltonian H: HEψ(x) = EψE(x). Which of the following statements are true? (A)A complete solution is given by ψ(x,t)=φE(x). (B)A complete solution is given by ψ(x,t)=φE(x)exp. (C)The full solution can be written as a product c(t)φE(x), where c(t) is some complex function of time. (D)The function c(t) above can have any arbitrary functional form. (E)If measured at some future time, the energy of the system described by c(t)φE(x) is E.