What is the expected geometry of CH3-NH-CH3?

Trigonal pyramidal Square planar  Trigonal bipyramidal  Trigonal planar

Trigonal bipyramidal

CH3-NH-CH3 is an amine in which two hydrogen atoms are replaced by methyl groups. The hybridization of N atom of amines is same as that of ammonia, and is also expected to have a pyramidal geometry, with N at the apex and the groups CH3, H and CH3 occupying the corners of a trigonal base.