[" 4.Let "A=[[1,0],[0,-1]]" and "B=[[1,x...

[" 4.Let "A=[[1,0],[0,-1]]" and "B=[[1,x],[0,1]]],[" If "AB=BA," then what is the value of "x" ? "],[[" (a) "-1," (b) "0],[" (c) "1," (d) Any real number "]]

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