What is the correct Spanish translation for "Not available"?

The phrase "Not available" translates to "No disponible" in Spanish. The word "disponible" on its own means "available," and when you add the negation "no" at the beginning, it effectively conveys the meaning of "not available."

This construction is a straightforward way to express unavailability in Spanish, making it the appropriate choice for translating the given phrase. The other options, while they are valid Spanish words, do not align with the meaning of "not available" and therefore do not serve as correct translations.