publickey is the answer. From TR-4647: "Existing single-factor authentication (1FA) administrator users can be modified to a two-factor authentication (2FA) login method. There are three methods with two combinations available. The three methods are password, publickey, and nsswitch. The two combinations are password and publickey, or nsswitch and publickey."
I think this is
D. Public key
https://www.netapp.com/media/17055-tr4647.pdf
upvoted 3 times
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