I'll give you a question, please answer with step-by-step reasoning process.
Though the thin film seemed fragile, for it's intended purpose it was actually nearly what?\nOptions:\n- indestructible\n- durable\n- undestroyable\n- indestructible\n- unbreakable

indestructible
The film was properly designed and manufactured to meet it's requirement.

.

The answer: indestructible