Which of the following statements is not true about British pub etiquette?

A、It is rude to start up a conversation with someone sitting at a table.;
B、You can shout“service” or wave money about to attract the attention of the barmen.;
C、You don’t have to tip bar staff in pubs.;
D、If you go to a pub with a group of people, usually one or two representatives will go and get the drink, not the whole group.