Which parameter determines whether an RI is regional or zonal, or specifies the Availability Zone within the region?

Which parameter determines whether an RI is regional or zonal, or specifies the Availability Zone within the region?

• A. Region
• B. Tenancy
• C. Availability Zone
• D. Operating System

Answer: (C)

Availability Zone determines the scope of a Reserved Instance. If you specify a particular AZ, the RI becomes zonal and applies only to that zone. If you leave the AZ unspecified (or rely on the region-wide setting), the RI is regional and can apply across all AZs in the region. This distinction matters for capacity planning and failover: zonal RIs lock capacity to one AZ, while regional RIs offer flexibility across AZs. Tenancy and Operating System do not affect whether an RI is regional or zonal.

Availability Zone determines the scope of a Reserved Instance. If you specify a particular AZ, the RI becomes zonal and applies only to that zone. If you leave the AZ unspecified (or rely on the region-wide setting), the RI is regional and can apply across all AZs in the region. This distinction matters for capacity planning and failover: zonal RIs lock capacity to one AZ, while regional RIs offer flexibility across AZs. Tenancy and Operating System do not affect whether an RI is regional or zonal.