The differential equation formed by eliminating arbitrary constants $A$ and $B$ from the equation $y = A \cos 3x + B \sin 3x$ is
- A$\frac{d^2 y}{dx^2} + y = 0$
- B$\frac{d^2 y}{dx^2} + 9y = 0$
- C$\frac{d^2 y}{dx^2} - 9y = 0$
- D$\frac{d^2 y}{dx^2} - y = 0$
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