Final answer:
Systems performance is primarily measured with benchmark testing, which is used to evaluate performance under specific conditions and compare different systems or components.
Step-by-step explanation:
Systems performance is measured with benchmark testing. This method involves running a series of tests on a computer system or component to evaluate its performance under specific conditions.
Benchmark testing provides standardized measurements that can be used to compare the performance of different systems or components. It is a way to quantify the speed, efficiency, and capacity of hardware, software, or an entire IT infrastructure.
Capacity planning and fault management are related to systems performance, but they serve different roles. Capacity planning involves predicting future system requirements to handle an increasing load, whereas fault management relates to identifying and addressing system errors or flaws, not directly measuring performance.
Therefore, the correct answer is b. Benchmark testing.