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For two statements are given $-$ one labelled Assertion $(A)$ and the other labelled Reason $(R).$ Select the correct answer to these questions from the codes $\ce{(a), (b), (c)}$ and $(d)$ as given below :
Assertion : Danger signals are red.
Reason : Red colour has smallest wavelength.

• A
  Both $A$ and $R$ are true, and $R$ is correct explanation of the assertion.
• B
  Both $A$ and $R$ are true, but $R$ is not the correct explanation of the assertion.
• ✓
  $A$ is true, but $R$ is false.
• D
  $A$ is false, but $R$ is true.