Let $\mathrm{A}=(\overline{\mathrm{i}}-\overline{\mathrm{j}}+3\overline{\mathrm{k}}), \mathrm{B}=(3 \overline{\mathrm{i}}+ 3 \overline{\mathrm{j}} + 3 \overline{\mathrm{k}})$ be two 

points and $\overline{\mathrm{r}}.(5\overline{\mathrm{i}} + 2\overline{\mathrm{j}} - 7\overline{\mathrm{k}}) +9 = 0$ be a plane, then

A, B lie on the same side of the plane 
 

A, B lie on the opposite side of the plane 
 

A, B lie on the plane 
 

can not be determined