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Which one of the following statement regarding auxin is$/$ are correct?

• A
  $\text{IAA}$ and $\text{NAA}$ are natural but $\text{IBA, 2, 4, 5-T}$ and $\text{2, 4-D}$ are synthetic auxins.
• B
  $\text{NAA}$ and $\text{2, 4, 5-T}$ are natural but $\text{IAA, IBA}$ and $\text{2, 4-D}$ are synthetic auxins.
• C
  $\text{IAA, NAA, IBA, 2, 4-D}$ and $\text{2, 4, 5-T}$ are synthetic auxins.
• ✓
  $\text{IAA}$ and $\text{IBA}$ are natural but $\text{NAA, 2, 4-D}$ and $\text{2, 4, 5-T}$ are synthetic auxins.