Which two statement about the DNS are true? (Choose two.)

A.
The client-server architecture is based on query and response messages.

B.
Query and response messages have different format.

C.
In the DNS message header, the QR flag set to 1 indicates a query.

D.
In the DNS header, an Opcode value of 2 represents a client status request.

E.
In the DNS header, the Rcode value is set to 0 in Query message.