A multinational corporation is embarking on a comprehensive cloud migration strategy for its global IT infrastructure. The organization has stringent requirements, including the need for complete administrative control over the hardware and operating systems to customize the environment for high-performance computing (HPC) tasks. Additionally, the solution must support scalability to accommodate fluctuating workloads while ensuring cost-effectiveness and compliance with international data sovereignty laws. Considering these requirements, which cloud service model would best meet the corporation's needs? (Choose one correct option.)