Identify $X$ and $Y$ in the given diagram of an anatropous ovule.

• A
  $X$ - Nucellus,$Y$ - Embryo sac
• B
  $X$ - Outer integument,$Y$ - Embryo sac
• C
  $X$ - Micropyle,$Y$ - Nucellus
• D
  $X$ - Micropylar pole,$Y$ - Nucellus