In regards to benchmarking, which of the following statements is incorrect?

a. Benchmarking is the practice of comparing a company with other leading companies.

b. The industry average is not a useful benchmark for evaluating a company.

c. The two main types of benchmarks in financial statement analysis include benchmarking against the industry average and benchmarking against a key competitor.

d. Providing common-size percentages in a graphical manner highlights differences.