Given below are two statements: one is labelled a Assertion \((A)\) and the other is labelled as Reason\((R)\) \(Assertion\) \((A)\) : Work done by electric field on moving a positive charge on an equipotential surface is always zero. \(Reason\) \((R)\) : Electric lines of forces are always perpendicular to equipotential surfaces. In the light of the above statements, choose the most appropriate answer from the options given below 

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