You are designing a domain naming strategy for the new environment.  Which two actions should you perform？（）

• 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.