To securely use dynamic DNS updates, the use of TSIG is recommended. Which TWO statements about TSIG are true?

A.
TSIG is used for zone data encryption

B.
TSIG is a signal to start a zone update

C.
TSIG is used in zone files

D.
TSIG is used only in server configuration

E.
Servers using TSIG must be in sync (time zone!)