Which of the following provides the MOST useful information to assess the magnitude of identified deficiencies in the IT control environment?

Peer benchmarks provide comparative data on industry standards, but they do not offer specific details about an organization's internal control deficiencies or their exact magnitude.

Internal audit reports specifically detail identified control deficiencies, their root causes, and often include an assessment of their potential impact and severity, providing a targeted and objective evaluation of the IT control environment's weaknesses.

Business Impact Analysis (BIA) results primarily assess the impact of *disruptions* to business processes and systems, rather than directly detailing or measuring the magnitude of IT control deficiencies.

Threat analysis results identify potential threats and vulnerabilities, but they don't inherently quantify the magnitude or effectiveness of *existing* IT control deficiencies in the current environment.