During project closure, which of the following actions must you take?

During project closure, retaining project data as per contractual requirements is essential because it ensures compliance with agreed-upon terms and conditions that often dictate how long and in what manner data should be stored or accessible. This retention may include project documents, client communications, and any other relevant data that could be necessary for future legal, financial, or operational purposes.

Returning customer-provided data is equally important as it respects the client’s ownership and confidentiality of their information. This action is a standard practice in maintaining trust and integrity in business relationships, ensuring that the client’s data is handled responsibly.

Both of these actions are critical for proper project closure, thus reinforcing the importance of adhering to contractual obligations while also safeguarding the client's information. Erasing all project data, on the other hand, may violate these obligations and could lead to legal ramifications or severed client relationships.