多项选择题

A.Register airlines.com as a new domain name.
B.Register manifest.airlines.com as a new domain name.  
C.Register manifest.blueyonderairlines.com as a new domain name.
D.Maintain the existing blueyonderairlines.com registered domain name.
E.Use the UPN suffix of airlines.com for all new users.  
F.Use the UPN suffix of blueyonderairlines.com for all new users.