A trademark is any brand name, word, symbol, or design (or combination thereof) that is legally registered or established by use as representing a company or product. It provides legal protection against unauthorized use by others.
Let’s clarify the terms:
Brand name: The verbal part of a brand (e.g., "Nike").
Brand mark: The symbol or logo part of the brand (e.g., the Nike swoosh).
Trademark: A legally protected brand name or mark.
Logo: A graphic mark or emblem used by a business (can be part of a trademark).
Thus, the correct and legally appropriate answer is (C) Trademark.