An organization is operating with three Availability Zones (AZ). It is decided to deploy multiple instances of a web application across all three AZs. An Azure networking product is then configured by

A Content Delivery Network (CDN) primarily caches web content at edge locations to reduce latency, not for distributing live application requests among backend servers.

Azure Application Gateway is a web traffic load balancer that operates at Layer 7 (HTTP/HTTPS) and can distribute incoming traffic to multiple backend instances, even across Availability Zones. It supports features like SSL termination and intelligent routing, making it ideal for managing web application traffic.

An Azure Load Balancer operates at Layer 4 (TCP/UDP) and performs basic traffic distribution based on IP address and port, lacking the advanced web application routing capabilities of Application Gateway.

A Web Application Firewall (WAF) protects web applications from common web exploits and vulnerabilities, but its primary function is security, not traffic distribution across application instances.