Grammar, Usage / classification: TV commercials [2]

Hi,
I'm so glad that I find this forum! please help me!
I have to write an college essay about the classification of TV commercials. I'm thinking to classify it into 3 parts: profit-organization, non-profit organization and government. But I feel confused of two things:

First, are these three parts belong to TV commercial "producers"? cause I want to start
one sentence as ''TV commercials can be classified by[blank], they are profit-organizations, non-profit organization and government""
Second, can I use these three catogories on my essay? I'm not sure if government's military call-up belongs to commercial ad.

I'd really appreciate that anyone could give me advice.