That would be number 3 you are using. See below...
John 10:30 is not a teaching on the trinity or that we should believe or confess that Jesus is God. There is no reason to take this verse to mean that Christ was saying that he and the Father make up "one God." The phrase was a common one, and even today if someone used it, people would know exactly what they meant... he and his Father are very much alike. When Paul wrote to the Corinthians about his ministry there, he said that he had planted the seed and Apollos had watered it. Then he said, "... he who plants and he who waters are one..." (1 Corinthians 3:8 NKJV). In the Greek texts, the wording of Paul is the same as that in John 10:30, yet no one claims that Paul and Apollos make up "one being." Christ uses the concept of "being one" in other places, and from them one can see that "one purpose" is what is meant. John 11:52 says Jesus was to die to make all God's children "one." In John 17:11, 21 and 22, Jesus prayed to God that his followers would be "one" as he and God were "one." I think it's obvious that Jesus was not praying that all his followers would become one being in "substance" just as he and his Father were one being or "substance." I believe the meaning is clear: Jesus was praying that all his followers be one in purpose just as he and God were one in purpose.
The trinitarian has only 3 to pick from...
1.) Use a verse from a bad translation.
2.) Use a verse that is taken out of context.
3.) Not understand how the words were used in the culture they were written in.