Concept:Regulatory road signs are official traffic signs that enforce legal rules on all road users.
Explanation:These signs are broadly classified into two main types.
The first type is prohibitive signs.
They forbid or restrict specific actions, such as no entry or no parking.
The second type is mandatory signs.
They instruct road users on actions that must be followed, such as stop, turn left, or keep left.
Together, these two categories cover every regulatory road sign.
Therefore, the correct classification is prohibitive and mandatory.
Answer:C. prohibitive and mandatory