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Let a = 2i - j + k, b = I + 2j - k and c...

Let a = 2i - j + k, b = I + 2j - k and c = I + j - 2k be three vectors. A vector in the plane of b and c whose projection on a is of magnitude `sqrt(2//3)` is

A

2i + 3j - 3k

B

2i + 2j + 3k

C

-2i - j + 5k

D

2i + j + 5k

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The correct Answer is:
A
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