Active Contract Set & UTXO State Model

The issuer is the signatory and the owner the observer of a `SimpleIou`. Bob transfers his IOU to Dana. Whose ACS holds the new IOU?

• Bob's and Dana's only
• The issuer's and Dana's
• Every participant on the synchronizer

Which of these leaves a contract active?

• Exercising a choice with no qualifier
• Exercising a `preconsuming` choice
• Fetching the contract inside a transaction