A web startup wants to implement single sign-on where its customers can log on to the site by using their
personal and existing corporate email credentials regardless of which company they work for. Is this directlysupported by SAML?

A.
No not without extensive partnering and API integration with all required email providers

B.
Yes SAML is a web based single sign-on implementation exactly fir this purpose

C.
No a better approach would be to use required email providers LDAP or RADIUS repositories

D.
Yes SAML can use oauth2 to provide this functionality out of the box