Which service must be enabled to use a common account and password across multiple resources?

Single Sign-On (SSO) is the service that allows users to access multiple applications or resources using a single set of login credentials, comprising a common username and password. This simplifies the user experience by reducing the number of passwords that need to be remembered and entered, thereby enhancing convenience and efficiency.

When SSO is implemented, a user is authenticated once and then granted access to various systems without needing to log in separately for each one. This not only streamlines access but also strengthens security, as users are less likely to reuse simple passwords across different platforms when they have a single secure access point.

Other services, such as Multifactor Authentication, Access Control Lists, and Role-Based Access Control, serve different purposes in enhancing security and managing access. However, they do not primarily focus on the simplification of the login process across multiple resources in the same way that SSO does.