How does DNS Tunneling exfiltrate data?

How does DNS Tunneling exfiltrate data?
A . An attacker registers a domain that a client connects to based on DNS records and sends malware through that connection.
B . An attacker opens a reverse DNS shell to get into the client’s system and install malware on it.
C . An attacker uses a non-standard DNS port to gain access to the organization’s DNS servers in order to poison the resolutions.
D . An attacker sends an email to the target with hidden DNS resolvers in it to redirect them to a malicious domain.

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Answer: A