Question

If \[ A= \begin{bmatrix} 1 & 0 \\ 0 & 1 \end{bmatrix} \] then $A$ is:

• A. Singular matrix
• B. Identity matrix
• C. Null matrix
• D. Skew-symmetric matrix

Hint:

Identity matrix acts like the number $1$ in matrix multiplication: \[ AI=IA=A \] for every compatible matrix $A$.

Answer 1

The Correct Option is B