答：臆造商标和任意商标是最强且最容易保护的。臆造商标是发明的词，没有任何已知含义。任意商标是真实的词，但其含义与所保护的商品没有关联。

A: The strongest and most easily protectable types of marks are fanciful marks and arbitrary marks. Fanciful marks are invented words with no dictionary or other known meaning. Arbitrary marks are actual words with a known meaning that have no association/relationship with the goods protected.