Final answer:
The authentication method requiring a userid and password plus a token is (option c)Multi Factor Authentication (MFA), involving multiple forms of verification.
Step-by-step explanation:
The authentication method described where Mattco employees must use a userid and password in addition to a token that must be inserted during authentication is known as Multi Factor Authentication (MFA). This method uses more than one form of authentication to verify the user's identity, which in this case, includes something the user knows (the password) and something the user has (the token).