मान लीजिए \( A=\left[\begin{array}{cc}1 & 0 \\ 0 & -1\end{array}\right] \) तथा \( B=\left[\begin...

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मान लीजिए \( A=\left[\begin{array}{cc}1 & 0 \\ 0 & -1\end{array}\right] \) तथा \( B=\left[\begin{array}{ll}1 & x \\ 0 & 1\end{array}\right] \) यदि \( A B=B A \) तो \( x \) बराबर है-
(A) \( -1 \)
(B) 0
(C) 1
(D) कोई वास्तविक संख्या
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