Which statement describes a DNS stealth attack using threat actors’ double IP flux technique?

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Which statement describes a DNS stealth attack using threat actors' double IP flux technique?

They use it in malware to randomly generate domain names that can then be used as rendezvous points to command and control servers.
They hide phishing and malware delivery sites behind a quickly-changing network of compromised DNS hosts.
They rapidly change the hostname to IP address mappings and to also change the authoritative name server to be difficult to identify the source of the attack.
They gather domain account credentials to silently create multiple sub-domains to be used during the attacks.