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 customer service representative at a call center would like to be able to collect information from customers using a series of question prompts.
What could be used to accomplish this?

In Salesforce Classic, Universal Containers provides access to Salesforce for their Customer Support and Sales Operations teams. Management wants to ensure that when users log in, their home tab provides access to links and documentation that are specifically relevant to their team's function.
How can this requirement be met?

Universal Containers generates leads from three different sources: web, trade shows, and partners. Some of the information collected is applicable to all sources, there is also information that is unique to each type of lead.
What should an app builder configure to meet these requirements?

At Universal Containers, each admin and developer use a separate developer pro sandbox. Configuration and code are then migrated to a partial data sandbox for combination and initial testing. Once approved the configuration and code are then migrated to a full sandbox for final toad and regression testing before going to production.
When should the full sandbox be refreshed?