What Is a Microbenchmark

What is a microbenchmark?

A) a real program, whose executions on various systems are evaluated to make comparisons between systems
B) a small program or function that measures the time required for a system to perform a specific operating system primitive or system operation
C) a program that is designed to evaluate the performance of a specific component or subsystem, such as the file system
D) a measure of "raw horsepower," used for making quick comparisons between hardware