How is DNS tunneling used to exfiltrate data out of a corporate network?

[answerhappygod]

How is DNS tunneling used to exfiltrate data out of a corporate network?

A. It leverages the DNS server by permitting recursive lookups to spread the attack to other DNS servers
B. It encodes the payload with random characters that are broken into short strings and the DNS server rebuilds the exfiltrated data Most Voted
C. It redirects DNS requests to a malicious server used to steal user credentials, which allows further damage and theft on the network
D. It corrupts DNS servers by replacing the actual IP address with a rogue address to collect information or start other attacks