What are the similarities between public service and social service

Public service means work for the government, in any capacity - civil servants.

Social service means work usually to help people with social problems, helping people handle bereavement, difficult children, divorce, problems with moving to a new area, immigrants, etc. It may involve people paid by the government, but one could have private social workers.

Explanation:

A human services professional focuses on the bigger picture. Social workers often work directly with clients to carry out social programs. As a human services worker, you may work as an administrator in an advocacy organization, which help support underserved communities.

i would say b. research typically uses a variety of sources