An equation of a plane parallel to the plane $x-2 y+2 z-5=0$ and at a unit distance from the origin is:
$x-2 y+2 z+5=0$
$x-2 y+2 z-3=0$
$x-2 y+2 z+1=0$
$x-2 y+2 z-1=0$
Correct Option: , 2
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