Apart from flashing red lights, what other indication shows that a school bus has stopped for students?

• Flashing amber lights
• A stop sign extended from the left side of the bus
  Explanation:

  "When a school bus stops for students, it not only activates its flashing red lights but also extends a stop sign from the left side of the bus. This serves as a clear visual signal for drivers to stop for the safety of children boarding or exiting the bus."
• A stop sign extended from the right side of the bus
• None of the above