Use case:
An object called "House" is related to Opportunity, there can be many Houses per Opportunity. On houses, we have a field named "Square feet". We need to show the total of Square feet for all houses on each Opportunity.
What type of relationship should we have?

Universal Containers is piloting new features in an existing sandbox and wants to prevent outbound email sends during testing.
What should the app builder do to meet the requirement?

Which attribute must field have to be used in external modeling?

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?

An app builder needs to change the data types of a few custom fields. The appbuilder is not able to delete and recreate any of the fields, nor modify any apexcode. Which data type change will require the app builder to perform additionalsteps in order to retain existing functionality?