(a) Both $\mathbf{(A)}$ and $\mathbf{(R)}$ are true and $\mathbf{(R)}$ is the correct explanation of $ \mathbf{(A)}$
(b) Both $\mathbf{(A)}$ and $\mathbf{(R)}$ are true and $\mathbf{(R)}$ is not the correct explanation of $ \mathbf{(A)}$
(c) $\mathbf{(A)}$ is true but $\mathbf{(R)}$ is not true.
(d) $\mathbf{(A)}$ is not true but $\mathbf{(R)}$ is true.