​The Process of Billing a Secondary Insurance Company Involves Which

​The process of billing a secondary insurance company involves which of the following?

A) ​After payment is received from the primary insurance,you must create a new bill with the secondary insurance information,or perform the electronic task of submitting the claim to the secondary insurer.
B) ​Click the unprinted paper claims link.
C) ​Check the set to bill link.
D) ​Billing at the same time you bill the initial claim to the primary insurance.