What action should you take to set up a single external IP for distributing requests across multiple regions?

To set up a single external IP for distributing requests across multiple regions, leveraging the Premium Tier for your load balancer is the most effective action. The Premium Tier enables global load balancing, which allows you to serve applications from multiple regions while using a single external IP address. This provides an efficient way to direct traffic while reducing latency and optimizing user experience, as requests can be intelligently routed to the nearest available instance across the regions based on various factors such as proximity and availability.

In contrast, switching to an internal load balancer would restrict access to internal resources only, not allowing for an external IP to handle incoming public requests. Adding multiple external IP addresses would complicate the architecture rather than simplifying it, and would not provide the desired single IP approach. Furthermore, using different VPCs for each region is not necessary for achieving a single external IP; such an approach would unnecessarily complicate the networking setup and would not directly address the requirement for a seamless external IP distribution across regions. Thus, opting for the Premium Tier is the most streamlined and effective solution.