As an AWS Certified Developer Associate, you're responsible for ensuring that traffic routing via a load balancer is optimized for performance. One of your team members has set up an Elastic Load Balancer (ELB) with the goal of distributing traffic evenly between instances or across Availability Zones. Despite this configuration, the ELB is directing more traffic to a particular instance or a specific Availability Zone rather than distributing it equally.

What could be causing this issue, and what are the potential solutions to fix it? (Select two)