INLAND ONLY At night, what lights are required on barges moored in a group formation at a river bank?

A
A flashing yellow light placed at each of the upstream and downstream ends of the group
B
A white light placed at the corners farthest from the bank of each barge in the group
C
A white light placed at the corners farthest from the bank on each of the upstream and downstream ends of the group
D
Two red lights in a vertical line placed at the corners farthest from the bank on each of the upstream and downstream ends of the group
E