In risk management, inherent risk refers to the exposure or amount of risk present without taking into account the controls. When controls are introduced, they reduce the inherent risk to a level known as residual risk, which is the remaining risk after controls are applied. The correct outcome for the scenario where controls are functioning as intended is that the residual risk is reduced to an acceptable level. It's important to note that rarely do controls completely eliminate risk, hence residual risk cannot typically be eliminated but only reduced to an acceptable threshold.
IIA guidance on risk assessment terms and concepts.

Outsourcing a business activity is considered a risk reduction technique. By outsourcing, an organization transfers certain activities to external service providers who possess specialized skills or resources, thereby reducing the associated risks that the organization may face if it had to manage those activities internally.
IIA guidance on risk management techniques

When a plant manager from within the organization is hired as a rotational internal auditor, the area he should most likely be trained for immediately is risk assessments. This training is crucial because understanding and performing risk assessments is fundamental to the internal audit function, and the plant manager may not have specific skills in this area despite having industry and management experience.
IIA education and training standards

In The IIA's Three Lines Model, internal audit (the third line) should be aligned with first- and second-line functions through effective communication, cooperation, and collaboration (Option D). This alignment ensures that internal audit activities are coordinated with risk management and control functions while maintaining independence. According to the Three Lines Model, internal audit adds value by providing independent assurance on the effectiveness of governance, risk management, and control processes, which requires ongoing interaction with the first and second lines without compromising objectivity.
IIA's Three Lines Model
IIA Standards, Standard 2050: Coordination and Reliance

An internal audit client survey is a tool that collects feedback from audit clients regarding the performance and effectiveness of internal auditors. This survey can highlight areas where a staff internal auditor may need improvement, including business acumen. Client feedback is direct and relevant, offering insights into how well the auditor understands the business context and applies this knowledge during audits.
* Option A: A quality assessment review focuses on the overall quality of the internal audit activity, not on individual staff business acumen.
* Option C: A control self-assessment involves self-evaluation of controls within business units, not directly addressing individual auditor's skills.
* Option D: A peer review assesses the internal audit activity's adherence to standards but does not specifically target business acumen of individual auditors.
IIA's Quality Assessment Manual.
IIA Practice Guide: Client Surveys.