A student was asked to find the equation of the tangent
plane to the surface [math]

(a)
At a glance, how do you know this is wrong. What mistakes did the student make? Select all that apply.

** A. ** The answer is not a linear function.** B. ** The (x - 4) and (y - 5) should be x and y.** C. ** The partial derivatives were not evaluated a the point.** D. ** The -2869 should not be in the answer.** E. ** All of the above

(b) Find the correct equation for the tangent plane.

[math]