A job placement agency advertised that last year its clients, on average, had a starting salary of $28,500. 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 are true, mark the appropriate box.

Last year more than half of their clients had a starting salary of at least $28,500.

Last year some of their clients had a starting salary of exactly $28,500.

Two years ago at least one of their clients had a starting salary of at least $28,500.

Last year some of their clients had a starting salary of at least $28,500.

Last year at least one of their clients had a starting salary of more than $30,000.

None of the above statements are true.