Answer:
If you are in an upscale restaurant, you must follow certain rules, such as make a reservation before, when you finally go to your designed table, you should sit and put the napkin on your legs, eat slowly and be polite. Â
Therefore, the correct dining etiquette among the options are:
The options No hay necesidad de hacer una reserva (There is no need to make a reservation) and Poner los codos sobre la mesa (Put your elbows on the table) are not according the dining ettiquete rules.