querylog format

[Jeff Peng]

Hello,

The querylog of BIND in my hosts is like:

client 58.240.56.18#16768: query: s18.mhxx.game.yy.com IN A -EDC

For the last part, I know the '-' means non-recursion，'E' means EDNS.
But what are the 'D' and 'C' flags?

thanks.

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