Universal containers wants to ensure that they are accepting clean data from their users and verify that important fields are entered. What should an app builder recommend to meet this requirement?

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?

Universal Containers needs to update a field on an Account when an Opportunity Stage is changed to Closed Lost. What tools can we use to accomplish this requirement? (Choose 2)

The Training team at UVC uses a custom Training object to track their customer trainings. An App Builder needs to create a relationship between the Training object and the related Student's record. A private sharing model is in place for both Students and Training. Which two statements are true when creating a Student lookup field on the Training object? Choose 2 answers

Duplicate management for leads has been implemented at universal containers but it seems duplicate leads are still being created. The org wide default is set to "Private" for leads.
Which two actions help prevent duplicate leads from being created?
Choose 2 answers.