Which of the following differential equations given below has the solution y=log x?

• A. ( frac{d^2 y}{dx^2} )-x=0
• B. ( frac{d^2 y}{dx^2}+( frac{dy}{dx})^2 )=0
• C. ( frac{d^2 y}{dx^2} ) ( frac{dy}{dx} )=0
• D. x ( frac{d^2 y}{dx^2} )-log u2061x=0