How would I answer the following vector intersection questions?

Question 1 (1 point) 1 Listen Question 8 (1 point) If ni . nz x nj = 0, then: Listen There is a single point of intersection The normal vector of 2x + 3y - z + 5 = 0 is: There may or may not be points of intersection [2, 3, -1, 5] The normal vectors are not coplanar [3, -1, 5] O B and C O [-2, -3, 1] ( 12, 3, -1] Question 3 (1 point) Listen For the three vectors a , band c' , it is found that a . b x c' = 0. Which statement below is true? O a) two of the three vectors are collinear O b) the three vectors are collinear O d the three vectors are linearly independent d) the three vectors are coplanar