What action is indicated by road marking A?

The choice indicating that parking is strictly prohibited is correct because road markings are designed to convey specific rules regarding parking to drivers. When a road marking clearly shows a prohibition symbol or certain colors associated with no-parking zones, it conveys to motorists that stopping or parking a vehicle in that area is not permitted. This is often found in areas where parking would obstruct traffic flow, block entrances, or pose safety hazards. Understanding these markings is essential for compliance with traffic regulations and for ensuring the safety of all road users.