Explanation

Dedicated Hosts is the correct answer because:

• Per-core licensing requires visibility and control over the physical CPU cores where software is installed
• Dedicated Hosts provide physical servers dedicated to a single AWS customer, allowing you to:
  • See the physical socket and core counts
  • Use your existing per-core software licenses
  • Comply with licensing terms that require physical core visibility
  • Bring Your Own License (BYOL) scenarios

Why other options are incorrect:

• Reserved Instances: Only provide billing discounts, not physical isolation or core visibility
• Spot Instances: Offer unused EC2 capacity at discounted prices, but don't provide physical server isolation
• Dedicated Instances: Run on hardware dedicated to a single customer, but don't provide visibility into physical cores or sockets

Dedicated Hosts are specifically designed for licensing scenarios where you need to track physical hardware attributes like socket and core counts for compliance with software licensing agreements.