Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Value of put if underlying stays below strike?
The value at expiration does not depend on the price path for a plain vanilla European or American option. At expiration, the value would simply be: max[K - S_T, 0], where: K is the strike price, and S_T is the underlying price at expiration.