Based on the provided image and text, identify at least three rules of "Table Manners" that are explicitly mentioned and explain what behavior each rule prohibits.

Table Manners Rules:

• 1) At the table you should sit up straight. This rule prohibits slouching or poor posture while eating.
• 2) You shouldn't eat with your fingers. This rule prohibits using hands to pick up and eat food directly, implying the use of cutlery.
• 3) You shouldn't put your elbows on the table. This rule prohibits resting one's elbows on the table surface, often considered impolite during meals.