A job placement agency advertised that last year its clients, on average, had a starting salary of $39,000. Assuming that average refers to the mean, which of the following claims must be true based on this information? Note: More than one statement could be true. If none of the statements is true, mark the appropriate box. Last year all of their clients had a starting salary of more than $37,000. This year some of their clients will have a starting salary of at least $39,000. Last year at least one of their clients had a starting salary of exactly $39,000. Last year, the number of their clients who had a starting salary of $39,000 or above was equal to the number of their clients who had a starting salary of $39,000 or below. Last year some of their clients had a starting salary of $39,000 or above. None of the above statements is true. ?