<h2>
Answer:</h2>
Option D: All of above.
is the correct answer.
<h2>
Explanation:</h2>
Risk of Collision can be defined as a chance when two different bodies start bearing same position after some time of following some courses/situations.
In order to determine risk of collision, many procedures are used. Some of them include procedures like Long-range radar scanning, Systematic observation of objects detected by radar and watching the compass bearing of an approaching vessel are used.
According to Rule 7 (Risk of Collision):
All accessible sources that are right according to the faced circumstances shall be used for each vessel so that the collision risks (if any) are determined easily.
<h2>I hope it will help you!</h2>
