What is the specific Guide for the SVG file logos?

On top of the other logo specifications, we also require you to share us a 3x SVG file logos in the following formats.  

1. Square Layout with Background (1x)

2. Landscape Layout without Background (1x)

3. Landscape Layout with Background (1x)

> It would be a plus if you were able to supply us with examples for Dark mode as well.