Answer:
C. They are shared beliefs about how the group members should think and behave within the group.
Explanation:
Group norms are not anywhere recognized, as they are not directed by any kind of formal body, rather it is a complete set of informal theories and principles to be followed when an individual is a part of group, as directed by the group.
It is basically the beliefs by the group management which will lead to the aim of achieving goals of the group.
They are neither negative nor positive, rather a set of disciplines to be followed when part of the group.