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Find the equation of a straight line in the plane ` vec r* vec n=d` which is parallel to ` vec r= vec a+lambda vec b` and passes through the foot of the perpendicular drawn from point `P( vec a)to vec rdot vec n=d(w h e r e vec ndot vec b=0)dot` a. ` vec r= vec a+((d- vec a*vec n)/(n^2))n+lambda vec b` b. ` vec r= vec a+((d- vec a* vec n)/n)n+lambda vec b` c. ` vec r= vec a+(( vec a* vec n-d)/(n^2))n+lambda vec b` d. ` vec r= vec a+(( vec a* vec n-d)/n)n+lambda vec b`

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