Which relationship can be selected in a custom report type where Accounts is the primary object and Contacts is the related object?

Reports and views are not renamed based on the new label value

An administrator at Universal Containers needs a simple way to trigger an alert to the director of sales when opportunities reach an amount of $500,000.
What should the administrator configure to meet this requirement?

Ursa Major Solar has a private sharing model on opportunities. Leadership has asked the administrator to create a new custom object that will track customer payment information and will link to the opportunity. Only those users with access to the opportunity should be able to see the records on the new object.
What should the administrator create to achieve this goal?

Which one of these may be a controlling field and a dependant field?