A SysOps Administrator Has Set Up a New Public Application

Multiple Choice

A SysOps administrator has set up a new public Application Load Balancer (ALB) in front of a pair of private web servers in multiple Availability Zones. After deploying an updated AWS CloudFormation template with many changes, user traffic now goes to one web server only. What is the MOST likely reason that the traffic is not being balanced between both servers?

A) The faulty server is returning HTTP 200 codes and has been removed.
B) Sticky sessions have been disabled in the ALB for the working server.
C) The ALB is using a custom ping path that is not found on the faulty server.
D) The web clients are using HTTP/2, which is terminated at the ALB.