Questions 4 to 7 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions.
Now listen to the conversation.
Which statement is NOT true about the bike messengers in New York
A．Many of them could have been in jail before. B．They don’t have to register. C．Their social security numbers must be checked in order to be employed. D．Their personal records are seldom checked.