Find the Vertex,focus,and Directrix of the Parabola $y = - 3 x ^ { 2 }$

Multiple Choice

Find the vertex,focus,and directrix of the parabola.​ $y = - 3 x ^ { 2 }$ ​

A) Vertex: (0,0) ;Focus: $\left( 0 , - \frac { 1 } { 12 } \right)$ ;Directrix: $y = - \frac { 1 } { 12 }$
B) Vertex:(0,0) ;Focus: $\left( 0 , - \frac { 1 } { 12 } \right)$ ;Directrix: $y = \frac { 1 } { 12 }$
C) Vertex: (0,0) ;Focus: $\left( 0 , \frac { 1 } { 3 } \right)$ ;Directrix: $y = \frac { 1 } { 3 }$
D) Vertex: (0,0) ;Focus: $\left( 0 , \frac { 1 } { 12 } \right)$ ;Directrix: $y = \frac { 1 } { 12 }$
E) Vertex: (0,0) ;Focus: $\left( 0 , - \frac { 1 } { 3 } \right)$ ;Directrix: $y = \frac { 1 } { 3 }$