Final answer:
The relationship between a lawyer and a client is known as the client-attorney privilege relationship, which is based on the attorney-client privilege to protect communication confidentiality.
Step-by-step explanation:
The type of relationship between a lawyer and a client is known as the client-attorney privilege relationship (c). This relationship is based on the attorney-client privilege, which is a legal principle that protects communications between a lawyer and their client from being disclosed without the client's permission. It is essential for preserving confidentiality and allowing clients to freely and openly communicate with their lawyers.