An Equation of the Tangent Plane to the Surfaceat (1 $x - y - 2 z = 0$

Multiple Choice

An equation of the tangent plane to the surfaceat (1, 1, 1) is

A) $x - y - 2 z = 0$
B) $x + y - 2 z = 0$
C) $x + y + 2 z = 0$
D) $x - y + 2 z = 0$
E) $- x + y - 2 z = 0$