During the planning stage of an assurance engagement, internal auditors should focus their attention on identifying and assessing inherent risks. Inherent risk is the risk of a material misstatement or noncompliance due to error or fraud that could occur before any controls are applied. Understanding inherent risk is crucial as it helps auditors identify areas that may need more extensive testing and ensures that audit resources are appropriately allocated to the highest risk areas.
The Institute of Internal Auditors (IIA) Practice Guide: Assessing the Adequacy of Risk Management Using ISO 31000 IIA Standard 2010 - Planning

Comprehensive and Detailed Explanation:
Completeness in invoicing means that all services delivered (electricity consumed) are properly billed.
Therefore, the most effective approach is directly comparing consumption data with billed amounts (D) to identify unbilled usage. Options A and C provide insight into payment behavior or consumption trends but do not test billing completeness. Option B (ratio analysis) could provide high-level patterns but would not pinpoint specific missing invoices. The most reliable procedure is a one-to-one reconciliation between metered consumption and invoicing data, as it ensures every unit of electricity delivered is accounted for in billing. This method aligns with IIA Standard 2310 - Identifying Information, which requires sufficient, relevant, and reliable evidence to support audit conclusions. By directly comparing inputs (consumption) and outputs (invoices), the auditor can identify systemic gaps, errors, or fraud in the billing process.

According to IIA guidance, the internal audit activity (IAA) can evaluate risk management processes without the need for safeguards. This activity aligns with the internal auditors' role in providing assurance on the effectiveness of the risk management process. Coaching management (Option A) and developing risk management strategies (Option B) involve direct participation in management functions, which could impair objectivity and require safeguards. Facilitating the identification and evaluation of risks (Option C) might also involve a degree of management participation that could compromise independence without proper safeguards. References: IIA Standard 2120 - Risk Management, IIA Practice Guide - Assessing the Adequacy of Risk Management Processes

According to IIA guidance, the CAE has the ultimate responsibility for the internal audit activity but may delegate tasks such as reviewing, approving, and signing engagement reports to qualified internal audit staff.
This delegation helps in managing workload and leveraging expertise within the team. However, the CAE should still periodically review the reports to maintain oversight and ensure quality. References: = IIA Standard 2060 - Reporting to Senior Management and the Board, and Standard 2400 - Communicating Results.

* Current ratio (A) measures general liquidity (Current Assets ÷ Current Liabilities).
* Quick ratio (C) (Quick Assets ÷ Current Liabilities) excludes inventory and prepaid expenses, giving a more immediate liquidity measure.
* Profit margin (B) measures profitability, and times interest earned (D) measures solvency.
Thus, the best measure of immediate liquidity is the quick ratio (C).