Which one(s) are part of American dinning rules?

A、The fork is held in the left hand facing down with the knife is held in the right hand.;
B、Napkins are placed on the lap if provided.;
C、You can feel free to refuse specific foods or drinks without offering an explanation.;
D、Rest your elbows on the table.;
E、Begin eating before the hostess starts or says to begin.;
F、If you invite someone to a restaurant, you don't need to pay.