Meterpreter is best described as:

• A. An advanced payload that runs in memory and provides interactive features.
• B. A vulnerability scanner.
• C. A network port scanner.
• D. A lightweight web server.

Answer: (A)

Meterpreter is an advanced payload that runs in memory and provides interactive features for post-exploitation. It loads into the target during exploitation, often leaving no disk footprint, and gives an interactive command environment plus a wide range of post-exploitation capabilities (file access, upload/download, process migration, keylogging, screen capture, credential access, pivoting, etc.) over an encrypted channel back to the attacker. Its in-memory operation and extensibility through extensions make it stealthier and more versatile than a simple shell, which is why it best fits the description. It isn’t a vulnerability scanner, a network port scanner, or a lightweight web server.