5.if the median annual salary for 4 employees is $60,000, then which of the following must be true? a. 2 people earn $60,000 a year or less, and 2 people earn $60,000 a year or more. b. 2 people earn less than $60,000 a year, and 2 people earn more than $60,000 a year. c. at least one person earns exactly $60,000 a year. d. the mean and mode are also $60,000.