The values of 'a' for which the points A...

The values of 'a' for which the points A, B, C with position vectors 2i-j+k, i-3j-5k and ai-3j+k respectively are the vertices of a right angled triangle with `C = pi/2` are

A

`-2` and 1

B

2 and `-1`

C

2 and 1

D

`-2` and -1

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The correct Answer is:

C

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