An archaeological dig turns up large numbers of pottery shards, broken stone implements, and other artifacts. Students working on the project classify each artifact and assign it a number. The counts in different categories are important for understanding the site, so the project director chooses 2% of the artifacts at random and checks the students' work. What are the population and the sample here?
a. Population: All students. Sample: The students' with the selected 2% of the artifacts.
b. Population: The selected 2% of the artifacts. Sample: All artifacts discovered in the dig.
c. Population: All artifacts discovered in the dig. Sample: The selected 2% of the artifacts.
d. None of the answers is correct.