To measure system performance, companies use , which uses a set of standard tests on one system to compare its performance and capacity to that of other systems.

benchmark testing

Explanation:

BENCHMARK TESTING can be regarded as method that is devices in the measurement of set of repeatable quantifiable results which usually taken as a point of reference in comparing products/services in a company. A benchmark must be a repeatable one, and it's application is also found in result testing in comparism of the present as well as well as future software releasees along with benchmarks. It should be noted that To measure system performance, companies use benchmark testing which uses a set of standard tests on one system to compare its performance and capacity to that of other systems.

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it's obviously d. it could be c though.