Explanation
To help employees remember fewer passwords, an identity architect should recommend setting up Salesforce as a service provider (SP) to the existing IdP. A SP is the system that relies on the IdP for authentication and provides access to its services based on the SAML assertions from the IdP. To set up Salesforce as a SP, you need to create a connected app for Salesforce in the IdP, enable SAML and configure the SAML settings, such as the entity ID, ACS URL, and subject type. You also need to enable SSO for your Salesforce org, upload the IdP certificate, and configure the SSO settings, such as the issuer, identity type, and service provider initiated request binding.
References:
[SAML Single Sign-On]
[Set Up Salesforce as a Service Provider]
[Enable Single Sign-On for Your Org]