Paul wants to integrate his organization’s web application with common cloud identity providers like Google and Microsoft. What authentication standard should he select if he wants to maximize interoperability?

OAuth is an open standard widely supported by cloud identity providers. Kerberos is used for internal use rather than for external integrations; LDAP is used for some services but is no longer a common choice for this type of integration with cloud service providers compared to options like OAuth, SAML, and OpenID-based integrations; and Active Directory is used by Microsoft but is not as interoperable.