A business magazine surveys 500 of its subscribers and determines that the median of their annual salaries is $48,000. Which choice is a valid inference in this situation?
A) All of the subscribers make at least $48,000.
B) 50% of the subscribers make more than $48,000.
C) None of the subscribers earn more than $48,000.
D) At least 60% of the subscribers make less than $48,000.