💡 Detailed Explanation
The correct choice is Option 2: 'Pay at the billing counter and receive the prescription.' The doctor states that before going to the pharmacy, the patient must settle the bill and get the prescription at the billing counter in the lobby: 'その前に、ロビーの会計窓口でお支払いをして、処方箋を受け取ってください' (Before that, please pay at the billing counter in the lobby and receive the prescription). Therefore, Option 2 is the immediate first action.