To how many levels can categories be nested in a service catalog?

A company's support process dictates that any time a Case is closed with a Status of "Could not fix," an Engineering Review custom object record should be created and populated with information from the Case, the Contact, and any of the Products associated with the Case.
What is the correct way to automate this using an Apex trigger?

Which of the following tables extend the task table? (Choose four.)

Under which circumstances is it appropriate to accept the risk of a problem?

Which of the following statements is true regarding the way the "Actual Start Date" is set in the change request form?