Toenable SP-initiated SSO with Salesforce as the Service Provider, two steps are required in Salesforce:

Option A is correct because configuring SAML SSO settings involves specifying the identity provider details, such as theentity ID, login URL, logout URL, and certificate2. 

Option D is correct because setting up My Domain enables you to use a custom domain name for your Salesforce org and allows you to use SAML as an authentication method3.

Option B is incorrect because creating a connected app is not necessary for SP-initiated SSO using a SAML-compliant IdP. A connected app is used for OAuth-based authentication or OpenID Connect-based authentication4.

Option C is incorrect because configuring delegated authentication is not related to SP-initiated SSO using a SAML-compliant IdP. Delegated authentication is a feature that allows Salesforce todelegate user authentication to an external service, such as LDAP or Active Directory5. References: SAML-based single sign-on: Configuration and Limitations, Configure SAML single sign-on with an identity provider, My Domain, Create a Connected App, Configure Salesforce for Delegated Authentication