The most efficient solution for a multi-location healthcare organization that wants to be able to access patient data wherever patients present themselves for care is B. Software as a Service (SaaS) provider. SaaS providers offer cloud-based services that allow organizations to access applications, data, and infrastructure on demand, making it easier to access patient data no matter where the patient is located. Reference: ISACA CISA Study Manual, section 5.3.3.1.