INLAND ONLY A power-driven vessel intends to overtake another power-driven vessel on the overtaken vessel's port side. What whistle signal should be sounded in order to state this intention?

Under Inland Navigation Rules, for the condition where 'A power-driven vessel intends to overtake another power-driven vessel on the overtaken vessel's port side. What whistle signal should be sounded in order to state this intention', the correct requirement is: '2 short blasts'. This standard ensures clear navigational intent and collision avoidance.