A student is using the quotient rule to find the derivative of the function 6x +7 f(x) = 2x +1 What is the correct way of writing the derivative of f(x)? (2x + 1) . . d -(6x + 7) OA. f( x ) = dx dx [(2x + 1)12 (6x +7) O B. f'(x) = a dx (2x + 1) (2x + 1) . d -(2x + 1) OC f(x) = dx -(6x + 7) - (6x + 7) . dx [(2x + 1)12 d dx -(2x + 1) .. d d dx -(6x +7) - - -(6x +7) . - -(2x + 1) OD. f(x) = dx dx [(2x + 1)12 O E. None of the above