If the payload of a DNS message is a query or response, the DNS header field that contains information about the message is the QR (Query/Response) field.
The QR field is a 1-bit field in the DNS header that indicates whether the message is a query (QR=0) or a response (QR=1). The ID (Identification) field is a 16-bit field that identifies the DNS query and is used to match responses with queries. The Z (Reserved for future use) field is a 3-bit field that is currently unused and must be set to 0. The TC (Truncated) field is a 1-bit field that indicates whether a message was truncated due to size limitations.
C. is the correct answer
QR ==> Flag indicating query(0) or response(1).
ID ==> is a 16-bit identifier assigned by the program. This identifier is copied into the corresponding name server response and can be used to differentiate responses when multiple queries concur.
Op ==> code. 4-bit field that specifies the type of query
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