Creating a plan for performance testing involves three fundamental activities. First, you must identify and define the critical business process scenarios that need to be tested (A). Second, for each scenario, you must define the workload by quantifying the expected normal and peak transaction volumes and user concurrency (D). This ensures the test realistically simulates production usage. Finally, you must establish clear, measurable success criteria, such as acceptable response times and throughput goals (E). These three elements—scenarios, volumes, and goals—form the core of any effective performance test plan, allowing you to validate if the system meets the required non-functional requirements under load.

B. User training is critical for user adoption and correct system usage but is not part of the technical process of defining system performance test scenarios.

C. While environment sizing is related to performance, defining the test scenarios, volumes, and goals comes first. These defined elements are then used to validate the adequacy of the environment sizing.

1. Microsoft Learn. (2023). Plan your performance test. Dynamics 365 Finance and Operations documentation. In the "Describe the business processes and usage pattern" section, it states the plan must include: "The scenarios that you want to test," "The anticipated load, based on the number of transactions and concurrent users," and "The performance goals (the key performance indicators [KPIs] that you want to achieve)." This directly supports options A, D, and E.

2. Microsoft Learn. (2023). Testing strategy. Dynamics 365 Implementation Guide. The "Performance testing" section emphasizes identifying "critical business processes," defining "transaction volumes for each process," and setting "performance goals" as key components of the testing strategy.

3. Microsoft. (2023). Success by Design for Dynamics 365 - Solution performance. The framework guidance for solution performance reviews emphasizes the need to define non-functional requirements early, which includes identifying critical scenarios, defining workload characteristics (volumes), and setting performance targets (goals and constraints). This aligns with the selection of A, D, and E as foundational planning steps.