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If the matrix A=[{:(alpha, beta),(beta,a...

If the matrix `A=[{:(alpha, beta),(beta,alpha):}]` is such that `A^(2)=I`, then which one of the following is correct ?

A

`alpha=0, beta=1" or "alpha=1, beta =0`

B

`alpha=0, beta ne 1" or "alpha ne 1, beta =0`

C

`alpha =1, beta ne 0" or "alpha ne 1, beta =0`

D

`alpha ne 0, beta ne 0`

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