You are steaming in a westerly direction along the Gulf Coast.You see ahead of you a lighted buoy showing a red isophase light.Which action should you take（）.
- AAlter course to port and leave the buoy to starboard
- BAlter course to starboard and leave the buoy to port
- CAlter course and leave the buoy near by on either side
- DAlter course and pass the buoy well-off on either side