Which MFA solution can be integrated with Cisco Jabber via SAML and used independently of...

This option is the correct MFA solution that can be integrated with Cisco Jabber via SAML and used independently of an IdP. Cisco DUO is a cloud-based MFA service that provides an additional layer of security for SAML SSO. Cisco DUO can be configured as a SAML IdP proxy that sits between Cisco Jabber and the actual IdP, or as a standalone SAML IdP that does not require another IdP. Cisco DUO supports various authentication methods, such as push notifications, phone calls, SMS messages, or hardware tokens. References:

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/jabber/12_6/cjab_b_planning-guide-cisco-jabber-12-6/cjab_b_planning-guide-cisco-jabber-12-6_chapter_0100.html

https://duo.com/docs/sso-cisco-jabber