60 Before leaving the table, please place your napkin on your chair or to the left of your plate as a _________ to the server that you will be returning.
(A)launch
(B)signal
(C)volume
(D)tenant

離開餐桌前，請將餐巾放在椅子上或餐盤左側，以此向服務生表示您會再次用餐。