The correct answer is 'Hybrid'. A hybrid deployment model involves a combination of on-premises, private cloud, and public cloud services, allowing organizations to balance between infrastructure control and scalability. Public refers to services fully hosted and managed by third-party providers accessible to many organizations. Private involves exclusive cloud services operated solely for one organization, whether managed internally or by a third-party. Public plus Private refers to a combination pertinent to the hybrid model but is not specifically recognized as a standard deployment model term.