RM520N Antenna Connectors explained

Hi!
I’m starting to get into the world of telecommunications and modems. I would appreciate it if someone could explain in more detail the four antenna connectors of a module like the RM520N.

There are four connectors, as shown in the following image, but I’m not sure what antenna connection I should make for certain things. For example, if I want to make a 5g nsa connection using only two antennas, how should the connections be?

image

Dear @Jilguero_Jilguero
Actually, you can refer to your NSA combination to contact the antennas.