Explanation
Multi-factor authentication is an identity management feature that the consultant can recommend to meet the requirement of authenticating to internal systems both by logging in with a username and password and by authenticating via an app on their phone. Multi-factor authentication is a feature that adds an extra layer of security to the login process by requiring users to verify their identity using a second factor, such as a mobile app, a security key, or an email link. Multi-factor authentication can help prevent unauthorized access and protect sensitive data. Single sign-on, connected apps, and social sign-on are not identity management features that require users to authenticate to internal systems both by logging in with a username and password and by authenticating via an app on their phone. References:
https://help.salesforce.com/s/articleView?id=sf.identity_mfa.htm&type=5
https://trailhead.salesforce.com/en/content/learn/modules/identity_login/identity_login_mfa