Final answer:
The duty of disclosure mandates parties to share material facts with others involved in a case or transaction. The most fitting example of this duty is informing parties of material facts that are pertinent to the transaction.
Step-by-step explanation:
The duty of disclosure in a legal context refers to the obligation of parties to a case or transaction to provide relevant information to the other parties involved. This ethics and legal duty ensures that all parties have access to the material facts that could influence decisions or the outcome of the case. An example of the duty of disclosure would be b. Informing parties to the transaction of material facts related to the transaction. This could include any information that might affect the value of a property in a real estate transaction, the strength of a case in a legal dispute, or the performance of a business in a merger or acquisition.
For comparison, options a and d, while important aspects of representation and client communication, do not specifically pertain to the disclosure of information to the other side of a transaction or a case. Option c, keeping a client's confidential information confidential, is related to the duty of confidentiality, not the duty of disclosure.