Which measurement is used to evaluate end-user experience or system responsiveness?

• A. Latency.
• B. Throughput.
• C. Security incidents.
• D. Backup frequency.

Answer: (A)

End-user experience depends on how quickly the system responds to requests. Latency is the time from sending a request to receiving the first response, so lower latency means faster, more responsive interactions and a smoother user experience. Throughput measures how much work is completed over a period, which relates to capacity but not per-request speed. Security incidents reflect security events, not responsiveness. Backup frequency concerns data protection, not how fast the system reacts. So latency best captures end-user experience or system responsiveness.