A penetration tester gained access to a server room by dressing as an engineer from a known third-party vendor. Which of the following types of penetration tests was performed?

Integrated penetration testing refers to testing that combines both physical and digital security measures within an organization. Although the tester did gain physical access, the scenario specifically describes a tactic aimed solely at bypassing physical security, not an integrated approach that assesses both physical and digital vulnerabilities.

A partially known environment test is conducted when the tester has some knowledge of the system but does not know all details. In this scenario, the tester's method of access does not relate to system knowledge; rather, it focuses on the physical access gained through deception, thus making this option irrelevant.

A known environment test involves the tester having full knowledge of the system and its vulnerabilities, often including detailed information about the network and applications. The action of impersonating a vendor engineer does not pertain to knowledge of the system itself, but rather to the physical approach taken to access the server room.