Complete control over physical and logical security measures is a primary advantage of on-premises solutions. The organization retains full control over all aspects of security, including access controls, surveillance, and response protocols, which are essential for sensitive systems. Cloud services, while secure, involve sharing some control with third-party providers. 'Reduced physical access risk' implies an advantage, but it is an aspect of complete control rather than a primary advantage in itself. 'Increased scalability' and 'Lower initial capital expenditure' are typically advantages of cloud solutions, not on-prem solutions. Therefore, they are not correct in the context of advantages for maintaining critical systems on-premises.