The correct option is C →b⋅→n=0,→a⋅→n=q
Normal of the plane →r⋅→n=q is →n and direction ratio of the line →r=→a+λ→b is →b
Since, line lies in the plane, normal and direction ratios should be perpendicular.
Therefore, →b⋅→n=0
Also position vector →a should lie on plane →r⋅→n=q
Therefore, →a⋅→n=q
Ans: C