Penstock owned a large tract of land on the shore of a lake. Drury lived on a stream that ran along one boundary of Penstock's land and into the lake. At some time in the past, a channel had been cut across Penstock's land from the stream to the lake at a point some distance from the mouth of the stream. From where Drury lived, the channel served as a convenient shortcut to the lake. Erroneously believing that the channel was a public waterway, Drury made frequent trips through the channel in his motorboat. His use of the channel caused no harm to the land through which it passed. If Penstock asserts a claim for damages against Drury based on trespass, which of the following would be a correct disposition of the case? 
Judgment for Penstock for nominal damages, because Drury intentionally used the channel.  Judgment for Drury, if he did not use the channel after learning of Penstock's ownership claim.  Judgment for Drury, because he caused no harm to Penstock's land.  Judgment for Drury, because when he used the channel he believed it was a public waterway. 