What is considered an "Identity Provider Initiated" login to an application?

What is considered an "Identity Provider Initiated" login to an application?
A . After signing in to the CyberArk Identity portal, a user launches a SAML app by clicking an app tile.
B . After visiting a third-party web app, a user is redirected to CyberArk Identity for authentication.
C . A user visits a third party web app directly and signs in with local credentials.
D . A user signs in to the CyberArk Identity portal and takes a screenshot of the portal to send to IT.

Answer: A