Universal Containers has developed Apex code to manually create AccountShare records to grant specific users access to individual Accounts. What must the Architect do to ensure the AccountShare records are not deleted when the owner of the Account is changed?

Universal Containers has developed an AppExchange managed package for their distribution partners, which required a private key to be generated for each partner and used by the code. Universal Containers support representatives must be able to access the private key value to debug connection issues, but it must not be possible for the partner to access the value.
How can the Architect best support this requirement?

A Visualforce controller has a requirement to be written with "Without Sharing" at the top level; however, certain methods within the page still need to enforce the user permissions for creating records and accessing certain fields. Which two methods below would be used to enforce this requirements?
Choose 2 answers.

Universal Containers has the following requirements: A custom Loan object requires Org-Wide Defaults set to Private. The owner of the Loan record will be the Loan Origination Officer. The Loan record must be shared with a specific Underwriter on a loan-by-loan basis. The Underwriters should only see the Loan records for which they are assigned. What should the Architect recommend to meet these requirements?

Universal Containers is a fast-growing company that sells containers globally. It has thousands of dealerships throughout the world where local dealers service Containers sold locally. They recently opened two dealerships in California: NorthCal and SoCal. Universal Containers implemented a new partner community to enable their dealers. Each dealership has a dealer Manager who has all service agents report into them.
Assuming a private sharing model, what is the best option to enable dealer managers to have visibility to customer cases within their dealership and not across all dealerships?