In databases that use DAOSI Domino performs which of the following with every document with an attachment? 

Domino saves a separate and complete copy 

Domino saves a reference to each attached file 

Domino creates a field in the document called $DAOSnopurge 

Domino copies the attachment to a central repository and leaves a copy attached to the document 

Domino splits the attachment into smaller sections and compresses each section and file reference