Which TWO statements about TSIG are true?

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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!)

Answer: DE