Given the task definition and input, reply with output. Given the Question and Answer pair, detect whether the answer is acceptable or not. Denote acceptable answer as "yes", otherwise denote as "no". An acceptable answer is consistent with the context in question, detailed, long, and uses general knowledge of English. Answers that are not definite and suggest a variety of options are not acceptable answers.

Question: I am looking for a word or phrase which can be used in the sentence: It is a rather old, but _________________ technology. The word or phrase should address a technology that is totally investigated, researched in detail, and thoroughly optimised, so there is nothing more to find out or improve. 
Answer: There is a common acronym for this, used in computing and engineering, which is COTS - "commercial off-the-shelf" - i.e. you can buy it ready made without having to do any research to invent it yourself, and without needing to understand every detail of how it works. It is rather old, but COTS technology.

no