An international company providing tsunami early warnings plans to deploy IoT devices globally to monitor sea waves. The IoT devices must transmit collected data to the company’s AWS infrastructure with minimal latency. The company operates three global centers, each connected to AWS via its own AWS Direct Connect link and to the internet through at least two upstream ISPs. The company uses its own provider-independent (PI) address space, and the IoT devices rely on TCP for reliable data transmission, with both landline and mobile internet connectivity. The solution spans multiple AWS Regions, and Amazon Route 53 is used for DNS services.

What connectivity design between the IoT devices and AWS Cloud services will ensure the HIGHEST availability?