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If $A = [\begin{array}{cc} 0 & - i \\ i & 0 \end{array}], B = [\begin{array}{cc} 1 & 0 \\ 0 & - 1 \end{array}]$ ,then $A B + B A$ is

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Correct option is A

AB=0−ii0100−1=0 ii 0and BA=100−10−ii0=0−i−i0Thus, AB+BA=O

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If A=0−ii0,B=100−1 ,then AB + BA is

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If $A = [\begin{array}{cc} 0 & - i \\ i & 0 \end{array}], B = [\begin{array}{cc} 1 & 0 \\ 0 & - 1 \end{array}]$ ,then $A B + B A$ is