What is true about Case Assignment rules? (Choose three.)

Universal Containers wants to improve the process to create Opportunity records related to an Account. Many fields can be populated based on the Account record. Some fields require input from the user.
What should an app builder configure to meet the requirement?

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?

Cloud Kicks wants to make sure that users without the Marketing role are unable to update the Contact Retail Opt In picklist field to Yes.
What validation rule would an app builder use to prevent other users from making this update?

An app builder wants to deploy a new version of an auto launched flow production in an active state so that the new functionality is immediately available to users.
What should the app builder take into consideration when planning the deployment?