A penetration tester is looking for a vulnerability that enables attackers to open doors via a specialized TCP service that is used for a physical access control system. The service exists on more than 100 different hosts, so the tester would like to automate the assessment. Identification requires the penetration tester to:
- Have a full TCP connection
- Send a `hello` payload
- Wait for a response
- Send a string of characters longer than 16 bytes
Which of the following approaches would BEST support the objective?

A. Run nmap -Pn -sV --script vuln . B. Employ an OpenVAS simple scan against the TCP port of the host. C. Create a script in the Lua language and use it with NSE. D. Perform a credentialed scan with Nessus.