What duty must board members and officers fulfill according to the Nonprofit Corporation Code?

The duty that board members and officers must fulfill according to the Nonprofit Corporation Code is the Duty of Care. This duty mandates that they act in good faith and exercise the care that an ordinarily prudent person would use in similar circumstances. It emphasizes the importance of being informed, making decisions with due diligence, and acting in the best interests of the organization and its members.

By adhering to the Duty of Care, board members and officers are expected to ensure that they are making sound decisions, avoiding conflicts of interest, and managing the nonprofit's resources effectively. This duty is fundamental to maintaining trust and accountability within the organization, as it helps to protect the community and serve the organization’s mission appropriately.

The other options, while they may resonate with responsibilities within an organization, do not specifically align with the key legal obligation that defines the conduct expected from board members and officers under the Nonprofit Corporation Code.