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

The values of `a` for which the points `A, B,` and `C` with position vectors `2hati - hatj + hatk, hati - 3hatj - 5hatk,` and `ahati - 3hatj + hatk`,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:
A
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