In a SAML-based SSO scenario, the identity provider (IdP) is the system that performs authentication and passes the user’s identity and authorization level to the service provider (SP), which trusts the IdP and authorizes the user to access the requested resource1. In this case, PingFederate is the IdP that authenticates users for UC and sends SAML assertions to the SPs. The SPs are the systems that rely on PingFederate for authentication and provide access to their services based on the SAML assertions. The SPs in this scenario are Salesforce Org1, Salesforce Org2, Financial System, and CPQ System2. Therefore, the correct answer is B.