An ecommerce application is running behind an Application Load Balancer. A developer observes some unexpected load on the application during non-peak hours. The developer wants to analyze patterns for the client IP addresses that use the application.
Which HTTP header should the developer use for this analysis?

A. The X-Forwarded-Proto header
B. The X-Forwarded-Host header
C. The X-Forwarded-For header
D. The X-Forwarded-Port header