Which subnet must be added when creating the load balancer in Phase 4?

What service is created in Phase 4 to distribute traffic across multiple Availability Zones?  

What is the purpose of adding multiple Availability Zones to the load balancer configuration? 

What metric is NOT directly monitored when configuring the Auto Scaling Group in Phase 4?

What triggers the Auto Scaling Group to add more instances?

The Auto Scaling group is based on memory utilization in Phase 4. 

Students must manually terminate instances when traffic increases.

During load testing, a healthy application should remain accessible through the load balancer. 

Load testing scripts are run manually from an AWS Cloud9 terminal.

Phase 4 involves creating a second public subnet for redundancy.