What is the recommended solution for securing the landing zones to meet both landing zone and business requirements?

An ExpressRoute gateway is the recommended solution for securing landing zones while fulfilling both landing zone and business requirements. ExpressRoute provides a private, high-throughput connection between on-premises networks and the Microsoft Azure cloud, allowing for increased security and reliability compared to public Internet connections.

Using ExpressRoute reduces exposure to the public Internet, thereby enhancing security for sensitive data. It also supports compliance with various regulations by ensuring that data remains within a controlled and private environment, aligning well with enterprise-level governance and risk management strategies.

In addition to the secure connectivity it offers, ExpressRoute supports features like low latency, high availability, and redundancy, which are crucial for businesses that require dependable access to cloud services while managing their landing zones effectively.

The other options, while they have their use cases, do not provide the same level of robust, dedicated connectivity and security tailored for enterprise needs as ExpressRoute. For instance, VPN gateways offer secure connections but depend on the public Internet, making them less ideal for high-traffic, sensitive, or compliance-focused environments compared to ExpressRoute.