If ΔMNL is rotated 180° about point N, which additional transformation could determine if ΔONP and ΔMNL are similar by the AA similarity postulate?

Segments OM and LP intersect at point N; triangles are formed by points LNM and ONP; line k intersects with both triangles at point N.

Reflect ONP over line k.
Reflect M′N′L′ over line k.
Dilate ONP from point N by a scale factor of segment NP over segment NL.
Dilate M′N′L′ from point N by a scale factor of segment NP over segment NL