Amanual, memo, or report would all be types of documents.

a. workplace

b. public

c. consumer

d. research

A manual, memo, or report would all be types of workplace documents.

Option A

Explanation:

A manual, memo and report serve as medium of information. It describes certain things or events and is then presented with references and citations.

They are generally used for formal communication in a workplace. These writings involves technical writing and are written in a certain format.