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Assertion $(A) : A=\left[\begin{array}{ll}2 & 3 \\ 1 & 4\end{array}\right], B=\left[\begin{array}{ll}1 & 0 \\ 0 & 1\end{array}\right]$, then $\ce{(A + B)^2 = A^2 + B^2 + 2AB}$.
Reason $(R):$ For the matrices $A$ and $B$ given in assertion, $\text{AB=BA}$.

• ✓
  Both $(A)$ and $(R)$ are true and $(R)$ is the correct explanation of $(A).$
• B
  Both $(A)$ and $(R)$ are true but $(R)$ is not the correct explanation of $(A).$
• C
  $(A)$ is true but $(R)$ is false.
• D
  $(A)$ is false but $(R)$ is true.