请问这里的that引导的是定语从句,还是同位语从句?useful在从句里做什么成分?

请问这里的that引导的是定语从句,还是同位语从句?useful在从句里做什么成分?
We do,however,cover the features that you will find most useful in meeting your reverse engineering challenges
【翻译】但是,你将发现,在应对逆向工程挑战时,本书介绍的功能及其有用
1 however这里是但是的意思
2 you will find most useful in meeting your reverse engineering challenges 先行词是features ,在从句中作宾语 you will find most features,useful形容词引起一短语作后置定语修饰features