A Trademark

A trademark:

A) is any word, name, symbol, or device, or combination thereof, which identifies one particular product or line of products from a single source.
B) prevents the whole ad from being legally used by another.
C) is required by law to be significantly different from the trade name of the organization that owns the trademark.
D) is registered and protected by the Library of Congress.
E) grants exclusive rights to the trademarked material for the life span of its owner plus an additional 50 years.