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Which of the following is/are correct ? ...

Which of the following is/are correct ?
(i) Adjoint of a symmetric matrix is also a symmetric matrix.
(ii) Adjoint of a diagonal matrix is also a diagonal matrix.
(iii) If A is a square matrix of order n and `lambda` is a scalar, then adj (`lambda A)= lambda^(n)` adj(A)
(iv) A (adj A) = (adj A) A = `|A| I`

A

Only (i)

B

(ii) and (iii)

C

(iii) and (iv )

D

(i), (ii) and (iv)

Text Solution

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The correct Answer is:
D
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