Identify the synthetic auxin and natural auxin from the following.

• A
  $IAA$ and $2,4-D$ $\quad$ $NAA$ and $IBA$
• B
  $NAA$ and $2,4-D$ $\quad$ $IAA$ and $IBA$
• C
  $IAA$ and $IBA$ $\quad$ $NAA$ and $2,4-D$
• D
  $NAA$ and $IBA$ $\quad$ $IAA$ and $2,4-D$