The Main Difference Between a Trade Name and a Trademark

The main difference between a trade name and a trademark is

A) trade names are licensed while trademarks are not.
B) trade names are commercial legal names under which a company does business,while a trademark identifies that a firm has legally registered its brand name.
C) a trade name is only the word that is spoken to distinguish a seller's products or services,but a trademark consists of both the spoken and unspoken word or mark that distinguishes a seller's products or services.
D) a trade name can cover an array of company product items while a trademark can only apply to a single SKU for a product item.
E) brand names are protected by law,but trademarks are not.