What is meant by “corporate author” in research?

The correct option is: A work produced by an institution, an association or a government agency.

Understanding "Corporate Author" in Research:
In academic research and citation styles (such as APA, MLA, or Chicago), an author is not always a single individual or a group of named people. Often, publications are issued by organizations, government departments, non-profit institutions, or professional associations. when these groups take collective responsibility for the writing and content of a document, they are designated as the corporate author (or organizational author). Examples include the World Health Organization (WHO), the United Nations Educational, Scientific and Cultural Organization (UNESCO), or the U.S. Census Bureau.

Why the other options are incorrect:
1. "A writer who belongs to a corporate company": A corporate author refers to the collective group or organization itself as the authorial entity in citations, not an individual human writer employed by a corporation.
2. "A writer who writes on matters of corporate affairs": This describes a subject matter expert or a corporate journalist, whereas corporate authorship refers to who published/produced the work rather than the topic of the work.
3. "A renowned author": A renowned author is simply a famous individual writer, which has no bearing on the structural definition of organizational or corporate authorship.