Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : The outer body of an air craft is made of metal which protects persons sitting inside from lightning-strikes.
Reason (R) : The electric field inside the cavity enclosed by a conductor is zero.
In the light of the above statements, chose the most appropriate answer from the options given below :

1. A Both \((\mathrm{A})\) and \((\mathrm{R})\) are correct and \((\mathrm{R})\) is the correct explanation of \((\mathrm{A})\)
2. B \((\mathrm{A})\) is correct but \((\mathrm{R})\) is not correct
3. C Both \((\mathrm{A})\) and \((\mathrm{R})\) are correct but \((\mathrm{R})\) is not correct explanation of (A)
4. D (A) is not correct but \((\mathrm{R})\) is correct