Where Is the Central Atom Located in a Trigonal Bipyramidal

Where is the central atom located in a trigonal bipyramidal molecule?

A) in the center of the plane shared by the two triangular pyramids, and at the point where the equatorial and axial bonds meet
B) at the end of an axial bond
C) at the end of an equatorial bond
D) on the middle edge of the plane formed by the two triangular pyramids
E) in the central face of any of the two triangular pyramids, where two bonds form a 120° angle