Comprehensive and Detailed Step-by-Step
Cold sites are the most cost-effective disaster recovery (DR) option since they require the least infrastructure investment. They provide space and power but no pre-configured systems.
Hot sites (A) are fully operational and very expensive.
Warm sites (D) offer some pre-configured hardware but still require setup, making them more costly than cold sites.
Clusters (C) are active failover systems, not DR sites.
Reference: CompTIA Network+ N10-009 Official Documentation - Disaster Recovery & Business Continuity Planning.