How should this functionality be enabled for UC, assuming ail social sign-on providers support OpenID Connect?

Universal Containers (UC) is rolling out its new Customer Identity and Access Management Solution built on top of its existing Salesforce instance. UC wants to allow customers to login using Facebook, Google, and other social sign-on providers.

How should this functionality be enabled for UC, assuming ail social sign-on providers support OpenID Connect?
A . Configure an authentication provider and a registration handler for each social sign-on provider.
B. Configure a single sign-on setting and a registration handler for each social sign-on provider.
C. Configure an authentication provider and a Just-In-Time (JIT) handler for each social sign-on provider.
D. Configure a single sign-on setting and a JIT handler for each social sign-on provider.

Answer: A