Which of the following statements regarding ethical hacking is incorrect?

This statement is correct - ethical hackers should remain independent and free from vendor financial relationships to avoid conflicts of interest that could bias their assessment.

Ethical hacking - also called penetration testing - is fundamentally defined by employing the same attack tools, exploits, and methods that real adversaries use; banning exploitation techniques would make it impossible to validate whether vulnerabilities are actually exploitable and would produce an incomplete security assessment. Restricting ethical hackers from using exploitation methods directly contradicts the core methodology of the discipline and the purpose of a penetration test.

This statement is correct - ethical hacking engagements are designed to be non-destructive, and writing to or permanently modifying target systems goes beyond the agreed scope of a legitimate assessment.

This statement is correct as a general guideline - performing testing remotely offsite is an accepted and common practice that simulates an external attacker and reduces physical access complications.