Which two statements are true when a new full sandbox is created? (Choose two.)

Which two statements are true when a new full sandbox is created? (Choose two.)
A . Chatter data will be copied to the sandbox by default.
B . Default e-mail deliverability is set to system e-mail only.
C . Usernames will be modified uniquely for that sandbox.
D . Users’ e-mail addresses will not be modified.

Answer: BC