The correct answer is D. Key work centers .
A bill of resources is used for capacity planning. It identifies the key resources or critical work centers needed to produce one unit of a product or product family. It is not the same as a bill of material, which lists components.
Exact extract: "The bill of labour approach - also known as the bill of resources or bill of capacity approach - uses more detailed data on the time standards for each product at the key resources." Another exact extract states: "One is a bill of resources which details key resources needed to produce one unit of product. These resources may include labour machinery tools space and materials." Therefore, the bill of resources typically contains information about key work centers/resources .

Increasing finished goods inventory investment will improve service levels by reducing the probability of stockouts. However, the relationship between inventory and service level is not linear, but rather asymptotic.
This means that as inventory increases, service level increases at a decreasing rate, approaching a maximum value. Therefore, option C is correct. Option A is incorrect because service level will not remain the same when inventory changes. Option B is incorrect because service level will not increase in direct proportion to inventory. Option D is incorrect because service level will not increase at an increasing rate as inventory increases. References: CPIM Part 2 Exam Content Manual, Version 8.0, Section A: Demand Management, Subsection A.3: Demand Management and Customer Service, p. 10.

A supplier certification program is a formal process of evaluating and approving potential suppliers based on certain criteria, such as quality, delivery, cost, and service. The purpose of a supplier certification program is to ensure that the suppliers meet the standards and expectations of the company and to reduce the risks and costs associated with poor supplier performance. A supplier certification program should start with the suppliers of "A" classified items, which are the most critical and valuable items for the company. These items have the highest impact on the company's profitability and customer satisfaction, and therefore require the highest level of supplier reliability and quality. By certifying the suppliers of "A" classified items, the company can improve its supply chain performance and reduce its dependence on inspection and corrective actions. This aligns with CPIM's focus on plan and manage supply and plan and manage distribution. References: The concepts are covered in detail in Module 3: Supply Management (1 and Module
7: Distribution and Logistics Management (2. You can also find more information about supplier certification programs from these sources: 3, 4, and 5.