It is a practice in some cultures to hug and even kiss when greeting a known business partner. What aspect of nonverbal language is being referred to in the above example?

Space

Explanation:

Territoriality is a term associated with nonverbal communication that refers to how people use space (territory) to communicate ownership or occupancy of areas and possessions. Personal space can be regarded as a bubble with a person at the center, forming an area which the person does not wish to be invaded.