Answer:
b. Ranking factors
Explanation:
Ranking factors are used to try to rank or determine which websites are better in certain fields or factors. E.g. which sites rank in top on mobile friendliness. It is just a way to classify websites or apps and categorize them. Another e.g., which apps rank in top in user experience. Companies can use these ranking factors and their results as benchmarks on what they can do to improve.
