Given below are two statements: one is labelled as Assertion \((A)\) and the other is labelled as Reason \((R)\). Assertion \((A)\): The total number of geometrical isomers shown by \(\left[\mathrm{Co}(\mathrm{en})_2 \mathrm{Cl}_2\right]^{+}\)complex ion is three Reason \((R)\): \(\left[\mathrm{Co}(\mathrm{en})_2 \mathrm{Cl}_2\right]^{+}\)complex ion has an octahedral geometry. 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 and \((R)\) is the correct explanation of \((A)\).
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 but \((R)\) is not the correct explanation of \((A)\).