Donor-imposed restrictions can be characterized as:

Donor-imposed restrictions are categorized based on the duration and nature of the restrictions placed by the donor on the use of funds or resources. The correct answer identifies these restrictions as either temporary or perpetual.

Temporary restrictions are those that can be fulfilled or removed with the passage of time or the occurrence of a specific event. For example, money donated for a specific project that must be completed within a certain timeframe would be considered temporarily restricted until the project is completed.

Perpetual restrictions, on the other hand, imply that the donor's intentions are to maintain the restrictions indefinitely. This typically involves donations meant to be held in perpetuity, with only the income generated from the donation being used for a particular purpose, such as scholarships or funding specific programs.

Thus, by identifying donor-imposed restrictions as temporary or perpetual, the correct answer reflects the necessary distinction in accounting for contributions received, ensuring that financial statements accurately represent the nature and restrictions of donated resources. Understanding these categories is essential for nonprofit organizations to comply with accounting standards and accurately report their financial position.