Accord to the metro ticketing rules, when a station officer finds that the passenger’s certificate is not valid for changing a ticket, what should he or she do?
A.The station officer should explain the reason why the ticket can’t be changed by the invalid certificate patiently.
B.The station officer could advise the passenger to buy the ticket by cash, the prepaid card or the mobile payment.
C.The station officer may throw the certificate out of the booth window and say no to the passenger directly.
D.If the passenger stays for a long time and insists that his certificate is valid and a ticket should be changed,the station officer may ask for other staff’s help.