Which type of code represents the Controller in MVC architecture on the Force.com platform? (Choose
2)

The sales management team at Universal Containers requires that the Lead Source field of the Lead record be populated when a Lead is converted.
What should be used to ensure that a user populates the Lead Source field prior to converting a Lead?

On a Visualforce page with a custom controller, how should a developer retrieve a record by using an ID that is passed on the URL?

Which type of controller should a developer use to include a list of related records for a Custom Object record on a Visualforce page without needing additional test coverage?

Which three statements are true regarding trace flags? (Choose three.)