When Can an Ordinary Word Such as "Window" Be Granted

When can an ordinary word such as "window" be granted trademark protection?

A) In any situation if the applicant is the first to apply for trademark protection of that word.
B) If the applicant can prove that the use of the word is novel.
C) If the word has acquired a secondary meaning.
D) If the applicant has used the word in the name of its product for at least 10 years.
E) If the word has become a generic term.