The matrix \(\left[\begin{array}{lll} 1 & 0 & 0 \\ 0 & 1 & 0 \\ 0 & 0 & 1 \end{array}\right]\) is a :
(A) scalar matrix
(B) diagonal matrix
(C) skew-symmetric matix
(D) symmetric matrix
Choose the correct answer from the options given below :
1
(A), (B) and (D) only
2
(A), (B) and (C) only
3
(A), (B), (C) and (D)
4
(B), (C) and (D) only