Who in the following situations is resorting to stereotyping?

*alicia was finding it difficult to get a job because she was 50 years old and companies seemed to prefer younger candidates.
*jennifer did not employ non-white people in her company.
*marcia, an hr manager, always gave preference to disabled people when interviewing suitable candidates.
*navin did not want to share his apartment with non-indians because he was more comfortable with his own ethnic group.
*wong’s manager rachel assumed that wong was hardworking because he was chinese.