Which of the following security methods BEST describes when a user enters a username and password once for multiple applications?

SSO works by issuing an authenticated session token after one successful login; that token is then accepted by all integrated applications, eliminating repeated credential prompts while centralizing identity verification through a trusted identity provider.

Permission propagation refers to the automatic inheritance of access rights from parent objects to child objects in a directory or file system, not to authentication across applications.

Inheritance in security contexts describes how permissions flow from parent to child resources; it is an access control concept unrelated to how users authenticate across multiple applications.

MFA (Multifactor Authentication) requires a user to present multiple verification factors during login and does not address reducing repeated logins across multiple systems.