Which opportunity standard field is available tobe configured directly? Choose3

Which values must be defined when creating a new Opportunity Stage? Choose 3 answers

Universal Containers has a junction object called Invoices with a primary Master-Detail relationship with Accounts and a secondary Master-Detail relationship with Contacts. The app builder has a requirement to change the primary Master-Detail relationship to Lookup. What happens to the Master-Detail relationship with Contacts?

A new custom object called invoices needs to have an invoice date for the date and time it was invoiced. What field type should be selected for this?

Universal Containers uses a custom picklist field Account Region on the account record. They want this region to be reflected on all related contact records and stay in sync if the value of this field changes on the Account.
How should an app builder meet this requirement?