[&] Which factor is typically included in multi-factor authentication that is not in single-factor authentication?
- Password
- Biometric verification -- Correct
- Email address
- Username

[&] What is a characteristic of single sign-on (SSO) authentication?
- It always requires biometric verification
- It reduces the need to re-enter credentials for different applications -- Correct
- It uses a single password for all services
- It requires logging in multiple times for different services

[&] Which of the following is an example of two-factor authentication?
- Email verification
- Username and password
- Password and PIN
- Password and security token -- Correct

[&] How does a one-time password (OTP) function?
- As a temporary password for a single session -- Correct
- As a comprehensive access key
- As a password reset mechanism
- As a permanent password for all logins

[&] What is the primary purpose of authentication mechanisms in web applications?
- To verify the identity of users trying to access a service -- Correct
- To increase the loading speed of a website
- To manage web application's storage capacity
- To encrypt user data during transmission

[&] Token-based authentication typically involves the use of:
- SSL certificates
- JSON Web Tokens (JWTs) -- Correct
- Biometric data
- Static API keys