For All the Hyperbolas in These Questions the Center of the Hyperbola

For all the hyperbolas in these questions the center of the hyperbola is (0, 0) .
The vertex is ( 0, -2) , the focus is (0, 4) , and the transverse axis is x= 0 .
-Identify a, p, and b.

A)
B)
C)
D)
E) None of these