Final answer:
Different greetings convey varying levels of formality and informality based on the language used.
Explanation:
¿Qué es esto? (What is this?) is not a greeting. Among the other options, ¿Cómo estás? (How are you?) is more informal, while ¿Qué tal? (How are you doing?) is considered more formal. The change in tone is caused by the level of familiarity and politeness conveyed in each greeting.
Learn more about Greeting etiquette in different languages here:
https://brainly.com/question/50910891
