Assuming you are entering K1 information into F1040...... is the K1 from 1065, 1120S, or 1041 ?

Or, if you are preparing a return and issuing K-1s, what type of return?

Is it bigger than a bread box?  As long as we are asking questions that nobody is answering I thought I would play along 

Not many of us around anymore who know what a bread box is.