This road sign means:

Slow down or stop.
Stop, if necessary.
You must come to a complete stop.
Drive with caution and be ready to stop.
The Correct Answer and Explanation is :
The correct answer is: You must come to a complete stop.
This road sign is a stop sign, which is universally recognized as a traffic control device that requires drivers to come to a full stop before proceeding. This is one of the most important signs for ensuring safety on the road, especially at intersections. The purpose of the stop sign is to control the flow of traffic and reduce the risk of accidents, particularly in areas where there may be limited visibility or heavy cross-traffic.
When you encounter a stop sign, the law requires you to bring your vehicle to a complete halt at the stop line, crosswalk, or intersection—whichever comes first. Even if there are no other vehicles or pedestrians visible, you must still stop. This is because the stop sign’s primary function is to give you the opportunity to check for other traffic or hazards before proceeding. After stopping, you should yield the right of way to any other vehicles or pedestrians that may have the right of way, and only proceed when it is safe to do so.
The importance of the complete stop is emphasized by the fact that many accidents occur at intersections. A rolling stop or failure to stop completely can lead to dangerous collisions, particularly in situations where drivers are not expecting other vehicles to cross their path. Failing to stop fully at a stop sign is also a traffic violation and can result in fines, points on your driving record, and even an increased risk of accidents.
In conclusion, the stop sign is not just a suggestion—it is a legal requirement. It is crucial for drivers to stop completely, check for other traffic, and proceed only when it is safe to do so. This ensures the safety of all road users.