On the Great Lakes, a power-driven vessel is crossing a river. A second power-driven vessel is ascending the same river. Which vessel must keep out of the way?

1. A. The ascending vessel, because it is the give-way vessel under the standard crossing rule
2. ✓ The crossing vessel, because it must keep out of the way of a vessel ascending or descending the riverCorrect
3. C. The ascending vessel, because it has the other vessel on its starboard side
4. D. Neither vessel; they must both take action because risk of collision exists