Identify the correct statements:
Statement $X$: Mitosis occurs in somatic cells and meiosis occurs in reproductive cells.
Statement $Y$: During mitosis,$DNA$ synthesis occurs once for one cell division,and in meiosis,$DNA$ synthesis occurs twice for two cell divisions.
Statement $Z$: Mitosis and meiosis occur in organisms that reproduce both sexually and asexually.

• A
  $X$
• B
  $Y$
• C
  $Z$
• D
  $X$ and $Y$ both