Which of the following statements is true about British pub etiquette？A.It is OK to star

Which of the following statements is true about British pub etiquette？

A.It is OK to start up a conversation with someone sitting at a table.

B.You should wait quietly for the waiters coming to serve you.

C.You should tip bar staff in pubs.

D.If you go to a pub with your friends, you should know how to buy the rounds.