Explanation

Elasticity in cloud computing refers to the ability to automatically scale resources up or down based on demand. The correct answers are:

• A. Diverting traffic to instances based on the demand: This is a key aspect of elasticity where traffic is automatically routed to instances that can handle the current demand, allowing for efficient resource utilization.

• B. Diverting traffic to instances with the least load: This is also part of elasticity as it helps distribute traffic evenly across available resources, preventing overloading of any single instance and maintaining performance.

Why the other options are incorrect:

• C. Diverting traffic across multiple regions: While this relates to high availability and disaster recovery, it's not specifically about elasticity which focuses on scaling within a region or availability zone.
• D. Diverting traffic to instances with higher capacity: This is more about load balancing based on instance capacity rather than the dynamic scaling aspect of elasticity.