Let f(2, 3) = 7. fx(2,3)=-1, and f,(2, 3) = 4. Then the tangent plane to the surface z = f(x, y) at the point (2, 3) is O(a) z 7-x+4y O (b) x-4y+z+3=0 (c)-x+4y+z=7 (d) -x+4y+z+3-0 O (e) z 17+x-4y