Single Sign On works by issuing:

Single Sign-On (SSO) works by issuing tokens, which facilitate a seamless authentication process across different applications and systems. When a user logs into an SSO service, they are granted a token that acts as a credential, allowing the user to access multiple applications without needing to log in separately to each one.

This token contains the user's authentication information and is used to verify their identity when they attempt to access various services, ensuring that they do not have to repeatedly enter their credentials. This enhances user convenience and improves security by centralizing authentication.

The other options, such as passwords, IDs, or tickets, do not accurately describe the mechanism by which SSO operates. Passwords are individual authentication methods but are not linked within the SSO framework. IDs serve as identifiers but do not encapsulate user credentials or facilitate the process of authentication across multiple systems. Tickets could refer to various ticketing systems in security but are not the standard term used in the context of SSO, where tokens are the primary means of managing authentication efficiently.