Select the dining etiquette you’re expected to follow at an upscale restaurant. sentarse en la mesa. no hay necesidad de hacer una reserva. poner los codos sobre la mesa. poner la servilleta sobre las piernas.

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.  

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.