If I want to merge into traffic by reversing, what precautions must I take?

If I want to merge into traffic by reversing, what precautions must I take?
A)Not to cover a distance greater than 15 meters.Correct
B)Merge even if it means invading an intersection.
C)Not to cover more than 40 meters.
As a general rule, driving in reverse is prohibited, except in the following exceptional cases and always covering only the minimum essential distance:

1. As a complementary maneuver to stopping, parking, or merging into traffic. In this case, the reverse distance may not exceed 15 meters and may not invade an intersection.
2. When it is not possible to move forward or change direction or course. In this case, there is no limit to the reverse distance, and it is even possible to invade an intersection if necessary.

The reverse maneuver is prohibited on motorways and dual carriageways.