The line PQ whose equation is x -y = 2 cuts the x-axis at P, and Q is (4, 2). The line PQ is rotated about P through 45^o in the anticlockwise direction. The equation of the line PQ in the new position is 

• A

  $y=-\sqrt{2}$

• B

  $y=2$

• C

  $x=2$

• D

  $x=-2$