GlobalCorp, a multinational financial institution, is expanding its cloud presence, leveraging multiple Infrastructure as a Service (IaaS) providers. They are implementing a new data analytics platform that processes sensitive customer data from various regions. Due to recent regulatory changes in several countries, GlobalCorp must ensure strict data sovereignty and residency requirements. The Chief Information Security Officer (CISO) is concerned about the potential for data breaches and non-compliance with these regulations. The current security architecture lacks centralized visibility and control over data flows and access across the cloud providers. Which of the following is the MOST effective approach for GlobalCorp to address the challenges of data sovereignty, residency, and centralized security management in their multi-cloud environment? a) Implement a cloud-native security information and event management (SIEM) solution integrated with each IaaS provider's logging and monitoring services, focusing on regional data centers. b) Deploy a cloud access security broker (CASB) that provides visibility and control over data access, usage, and movement across all cloud providers, with data loss prevention (DLP) and encryption capabilities. c) Establish a dedicated security operations center (SOC) staffed with regional experts in each country where data is processed, relying on manual monitoring and incident response. d) Create a custom-built data governance platform that enforces data residency rules by replicating data across multiple regions within each cloud provider, ensuring redundancy and availability.