Marina Board Exam: A vessel engaged in trawling, in addition to its identity lights, is exhibiting two white lights in a vertical line. What is she doing?

Marina Board Exam  

A vessel engaged in trawling, in addition to its identity lights, is exhibiting two white lights in a vertical line. What is she doing? 

A. shooting her nets 

B. hauling her nets 

C. her nets have come fast an obstruction 

D. she is in distress 

Answer:  A.  shooting her nets