A
But the scripture doesn't say it's a different glory. Also is says "one in us" as in we are sharing with christ and God. It says that we all need to be one the same way Christ and God are one, and then says that we need to be one with them as well. With the trinity it is saying that we must all be one entity like God and Jesus as well as the same entity as these 2.
It must then be talking about the unity of those who are in the faith. We can never be part of God's being and essence. However, we can have a unity in the faith, as believers.
This passage from John 17 is not the best to show the Trinity, since people misuse it.