A cloud administrator needs to configure multiple web servers to participate actively in workload processing. Which of the following will BEST help the administrator achieve this goal?

While autoscaling adjusts the number of instances based on demand, it doesn't inherently ensure active workload distribution among existing instances; load balancing is required for that.

Deploying an availability group ensures high availability by distributing instances across fault domains, while enabling load balancing actively distributes incoming client requests across these multiple web servers. This combination ensures that all servers participate in workload processing and provides resilience against single points of failure.

A reverse proxy can distribute traffic, but it's often a single point of failure itself unless paired with high availability, and the question specifically asks for multiple web servers to participate, which implies a broader solution.

Making each website public and using an HA group does not inherently distribute client requests across servers; an HA group primarily provides redundancy, not workload distribution.