Let A[(1, sin alpha,1),(-sin alpha,1,sin...

Let `A[(1, sin alpha,1),(-sin alpha,1,sin alpha),(-1,-sin alpha,1)]," where "0le alpha le 2 pi,` then:

A

`|A|=0`

B

`|A| in (2,infty)`

C

`|A| in (2,4)`

D

`|A| in [2,4]`

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The correct Answer is:

D

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