Thanks to the person that wrote the tutorial "Understanding Soft Proofing". It has helped me grapple with color management. (But I'm not done.)
Assume I have applied soft proofing to a file. If I then go to the "Print" dialog box, and select "Color Management", I get a choice under "Source Space" of "Document-Adobe RGB (1998)" and "Proof Setup SP2200..."
Which of the two should be selected?