I am planning a trip from Copenhagen to Oslo and am looking for the best way to get there. I am wondering if there are any good options for transportation. I am hoping to find an option that is both convenient and economical. I would like to know if there are any train, bus, or ferry services available, and what the approximate cost and travel time would be. Additionally, I am curious if there are any other transportation methods that I should consider. Any advice or suggestions would be greatly appreciated.