| You are approaching an open drawbridge and sound the proper signal. You receive no acknowledgment from the bridge. Which action should you take? |
| A) Hold in the channel as a vessel is closing the bridge from the other direction. |
| B) Resound the opening signal and do not pass through the bridge until signals have been exchanged. |
| C) Approach under full control to a position no closer than 400 yards from the bridge and await a signal from the bridge. |
| D) Approach with caution and proceed through the open draw. |
