The is (are) a collection of norms that describe how we expect someone in a particular position to act.

The role is  a collection of norms that describe how we expect someone in a particular position to act.
Norms are methods for behaving that are viewed as typical in a specific society.From a sociological point of view, social standards are casual understandings that administer the conduct of individuals from a society.Social psychology perceives smaller gathering units, for example, a group or an office. As such,norms are viewed as aggregate portrayals of satisfactory group conduct and also singular impression of specific group conduct.

Ithink the answer you are looking for is (b).