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Let vec a=2 hati+hat j+ hat k , vec b=h...

Let ` vec a=2 hati+hat j+ hat k , vec b=hat i+2hat j- hatk` and a unit vector ` vec c` be coplanar. If ` vec c` is perpendicular to ` vec a ,` then ` vec c` is a.`1/(sqrt(2))(-hat j+hat k)` b. `1/(sqrt(3))(-hat i-hat j-hat k)""` c. `1/(sqrt(5))(-hat k-2 hat j)` d. `1/(sqrt(3))(hat i-hat j- hat k)`

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