Which two rules can be configured for the Opportunity object? (Choose two.)

Universal Containers wants their Field Sales team to only see the accounts that they own. Separate North American and European marketing teams should only see accounts in their respective regions. The Inside Sales Team needs to see all accounts in Salesforce.
How can this be accomplished?

DreamHouse Realty (DR) has a policy that requires the phone number on Contact to be deleted when the DoNotCall checkbox is checked.
What automation tool should the app builder recommend?

Universal container would like to use a chatter group for their mergers and acquisitions team to collaborate on potential new projects. This project should not be visible for non-members to see or join, and can be accessed by invites only.

UVC uses a custom object to track expense reports. They would like to automatically post updates in a record's feed whenever an expense report has been approved. Which social feature can be used to accomplish this?