Which of the following is an example of an ad hoc document?

An ad hoc document is typically created for a specific purpose or to address a particular situation that may not be covered by standard procedures or policies. In this case, the example that aligns with the definition of an ad hoc document is that which is crafted for a specific purpose.

The option referring to memos and emails from the supervisor suggests communication that is often intended for specific situations, making it ad hoc in nature. These communications are typically not standardized and can vary depending on the context or issue at hand, which is characteristic of ad hoc documents.

Other types of documents listed, such as contracts negotiated with an employees' union and budget proposals, are more formalized and structured, intended for ongoing uses or situations that require adherence to established frameworks and guidelines. They do not generally fit the classification of ad hoc because they are usually part of broader, routine processes in organizational management.