Problem 9. (10 points) Consider the the Initial value problem x + 2x + 50x = 4 cos(5t), z(0) = 0, z' (0) = 0. Which of the following is the simplest algebraic form of the steady-state solution of the problem? (check one) DA. y = At cos(5t) + Bcos(5t) DB. y - A cos(5t) + Bsin(5t) + Ct cos(5t) + Dt sin(5t) Oc. y = At sin(5t) + B sin(5t) OD. y = A cos(5t) + Bsin(5t) )E. All of the above are solutions Enter the steady-periodic solution Is, of the Initial value problem: T sp