Which of the following statement(s) is/are correct? (i) Every skew-symmetric matrix is non-inver...

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Which of the following statement(s) is/are correct?
(i) Every skew-symmetric matrix is non-invertible.
(ii) If \( \mathrm{A} \) and \( \mathrm{B} \) are two \( 3 \times 3 \) matrices such that \( \mathrm{AB}=\mathrm{O} \), then alteast one of \( \mathrm{A} \) and \( \mathrm{B} \) must be null matrix.
(iii) If the minimum number of cyphers in an upper triangular matrix of order \( n \) is 5050 , then the order of matrix is 101.
(iv) If \( A \) and \( B \) are two square matrices of order 3 such that det. \( \mathrm{A}=5 \) and det. \( \mathrm{B}=2 \), then det. (10AB) equals \( 10^{4} \)
(a) (i), (ii), (iii)
(b) (ii), (iii), (iv)
(c) (i), (ii), (iii), (iv)
(d) (iii), (iv)
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