* Subject: The subject of a sentence is who or what is performing the action. Here, "programs" is the subject, doing the action of being "taped".
* Noun: A noun is a word that names a person, place, thing, or idea. "Programs" is a noun because it names a thing (likely referring to a collection of television shows or other broadcasts).
Therefore, in this sentence, "programs" is a noun and also acts as the subject.
Important Note: The sentence has a grammatical error. It should read "Each program was taped". "Programs" is plural, while "each" indicates a singular item.