Answer: In-group
Step-by-step explanation:
In-group is defined as the social group in which an individual can persist and can be recognized as that group's member or participant in psychological terms. This type of group indicates about the presence of the member in the group and feeling of community is experienced.
According to the situation described in question, floor of Janet is regard as in -group because she experiences the feeling of link and belongingness even if she does not contact with every girl on daily basis. Thus, she can be identified as the member of the floor as she is involved in the floor with other girls.