A consultant managing multiple client tenants needs centralized visibility and control. What should they implement?

Azure Lighthouse is the correct choice because it enables cross-tenant management, allowing service providers (like consultants) to manage resources across multiple customer tenants from their own Azure tenant. This provides centralized visibility and control without needing to switch directories. Azure Monitor is for collecting, analyzing, and acting on telemetry from Azure and on-premises environments, not for cross-tenant management. Azure Blueprints help define repeatable sets of Azure resources that implement standards and requirements, but don't offer cross-tenant control. Azure Policy helps enforce organizational standards and assess compliance at scale within a single tenant or across subscriptions, but not across disparate customer tenants in the way Lighthouse does.