Which publication is NOT considered a periodical?

A) New York Post
B) Rolling Stone
C) Encyclopedia Britannica
D) Journal of Educational Research

Encyclopedia Britannica is not considered a periodical because it is a reference work published at fixed intervals over a period of time, but it does not fit the typical definition of a periodical, which is a publication that releases new issues or volumes regularly (e.g., daily, weekly, monthly, quarterly). Periodicals include newspapers, magazines, and journals, which publish content on an ongoing basis, unlike encyclopedias that are updated less frequently and aim to provide comprehensive coverage on a wide range of topics.