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.&e
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