Which of the following is needed to complete the minimum requirements for a multifactor authentication:

I. Block chain proof of stake
II. Encryption keys
III. Block chain proof of work
IV. TCP/IP

A) I, II, III
B) III and IV
C) None of these
D) All of these


And also:

Which of the following is needed to complete the minimum requirements for a two authentication:

I. Password
II. VPN
III. Firewall
IV. Phone Number

A) I only
B) I and II
C) II and III
D) I and IV