Given below are two statements: one is labelled as Assertion \((A)\) and the other is labelled as Reason \((R)\). Assertion \((A)\) : \(\mathrm{NH}_3\) and \(\mathrm{NF}_3\) molecule have pyramidal shape with a lone pair of electrons on nitrogen atom. The resultant dipole moment of \(\mathrm{NH}_3\) is greater than that of \(\mathrm{NF}_3\). Reason \((R)\) : In \(\mathrm{NH}_3\), the orbital dipole due to lone pair is in the same direction as the resultant dipole moment of the \(\mathrm{N}-\mathrm{H}\) bonds. \(\mathrm{F}\) is the most electronegative element. In the light of the above statements, choose the correct answer from the options given below:

1. A Both \((A)\) and \((R)\) are true and \((R)\) is the correct explanation of \((A)\)
2. B \((A)\) is false but \((R)\) is true
3. C \((A)\) is true but \((R)\) is false
4. D Both \((A)\) and \((R)\) are true but \((R)\) is NOT the correct explanation of \((A)\)