The Unit-Normal Vector to the Plane Defined by the Points $\frac { 2 } { 3 } i + \frac { 1 } { 3 } j + \frac { 2 } { 3 }$

Multiple Choice

The unit-normal vector to the plane defined by the points (0, 1, 1) , (1, 1, 0) , and (1, 3, 1) is

A) $\frac { 2 } { 3 } i + \frac { 1 } { 3 } j + \frac { 2 } { 3 }$
B) $\frac { - 1 } { 3 } \boldsymbol { i } + \frac { 2 } { 3 } \boldsymbol { j } + \frac { 2 } { 3 } \boldsymbol { k }$
C) $\frac { 2 } { 3 } i + \frac { 1 } { 3 } j - \frac { 2 } { 3 }$
D) $\frac { 2 } { 3 } \boldsymbol { i } + \frac { - 1 } { 3 } \boldsymbol { j } + \frac { 2 } { 3 } \boldsymbol { k }$