Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Net dipole moment of a polar linear isotropic dielectric substance is not zero even in the absence of an external electric field.
Reason (R) : In absence of an external electric field, the different permanent dipoles of a polar dielectric substance are oriented in random directions.
In the light of the above statements, choose the most appropriate answer from the options given below :

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