An equation of a plane parallel to the plane $x - 2y + 2z - 5 = 0$ and at a unit distance from the origin is

Question

( A ) $x - 2y + 2z - 3 = 0$
( B ) $x - 2y + 2z + 5 = 0$
( C ) $x - 2y + 2z - 1 = 0$
( D ) $x - 2y + 2z + 1 = 0$