The type of authentication that requires only a username and password is: b. single-factor authentication.
A password can be defined as a string of characters, phrase or word that is designed and developed to distinguish an unauthorized user from an authorized user, especially through an identification and authentication process.
SFA is an abbreviation for single-factor authentication and it can be defined as a security system that is designed and developed to require end users to provide only their username and password, in order to enable them access a secured computer resource.
In this context, we can infer and logically deduce that the type of authentication that requires only a username and password is single-factor authentication.
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