Authentication ensures that system users are who they say the are. At Colvine Tech, a system user must prove identity by providing an email address, a password, and answer a security question before…

Multi-factor authentication requires using two or more *different* authentication factors, such as something you know, something you have, or something you are, which is not met by the given example.

'Authentication and accountability' describes a broader security principle and is not a specific type of authentication factor or mechanism for proving identity.

All three elements-email address, password, and security question-belong to the 'something you know' authentication factor. To achieve multi-factor authentication, at least two *different* factors (e.g., something you know and something you have) must be used.

Dual-factor authentication is a specific type of multi-factor authentication involving exactly two distinct factors; this scenario only utilizes one factor type.