Which of the following cannot be changed after you deploy an Office 365 tenancy? (Choose two.)

A.
Tenant name

B.
Tenant region

C.
Global administrator

D.
Billing administrator

Explanation:
A)
Correct: Tenant name cannot be changed after deployment.
B)
Correct: Tenant region cannot be changed after deployment.
C)
Incorrect: User accounts assigned the global administrator role can be changed after deployment of an Office 365 tenancy.
D)
Incorrect: User accounts assigned the billing administrator role can be altered after deployment of an Office 365 tenancy.