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.
