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A unit vector parallel to the intersec...

A unit vector parallel to the intersection of the planes ` vec r. \ ( hat i- hat j+ hat k)=5 \ a n d \ vec r. \ (2 hat i+ hat j-3 hat k)=4` a. `(2 hat i+5 hat j-3 hat k)/(sqrt(38))` b. `(-2 hat i+5 hat j-3 hat k)/(sqrt(38))` c. `(2 hat i+5 hat j-3 hat k)/(sqrt(38))` d. `(-2 hat i-5 hat j-3 hat k)/(sqrt(38))`

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