Comprehensive and Detailed Explanation (aligned to N10-009): APIs (Application Programming Interfaces) allow automation tools and scripts to push configurations to network devices programmatically. Modern network automation platforms rely on APIs to ensure consistency and scalability. A). RDP is remote desktop for Windows systems, not automation. B). Telnet is insecure and manual. C). GUI requires manual configuration, not automation. References (CompTIA Network+ N10-009): Domain: Network Operations - Automation, orchestration, APIs in network management.