Devide a face

I saw someone on Youtube devided a face. If u subdevide a face you get 4 faces, i only want to split a face in half.

How do i do That

a) In edge mode select opposing edges and subdivide, or
b) subdivide the face and dissolve unwanted edges, or
c) use Loop Cut tool, or
d) use Knife tool

i’ll give it a try thanks!