EC2 RI capacity reservation: which of the following is true?

• A. They can be allocated to any instance at any time
• B. They are available only to the account that purchased the RI
• C. They can be allocated across accounts within the organization
• D. They guarantee capacity region-wide for all instances

Answer: (B)

Capacity Reservations in EC2 are owned by the account that creates them and reserve a defined amount of capacity in a specific Availability Zone for a particular instance type and platform. They’re not available to other accounts by default, which is why the true statement is that these reservations are available only to the account that purchased them. When you launch instances to use that reservation, they must match the reserved attributes (instance type, AZ, etc.). The other options are inaccurate because capacity reservations aren’t universally transferable to any instance, aren’t automatically shared across accounts within an organization, and don’t guarantee region-wide capacity for all instances.