As shown in the figure,a particle is placed at $O$ in front of a plane mirror $M$. $A$ man at $P$ can move along the path $PY$ and $PY'$. Which of the following is true?

• A
  For all points on $PY$,the man can see the image of $O$.
• B
  For all points on $PY'$,the man can see the image,but for no point on $PY$ can he see the image of $O$.
• C
  For all points on $PY'$,he can see the image,but on $PY$ he can see the image only up to a distance $d$.
• D
  He can see the image only up to a distance $d$ on either side of $P$.