Mrs. Black lives in a small village. Her husband is dead. Her son, Jack, lived with her. He worked in a shop in the village, but then he found a job in town named Green Sea. He went to live there. Mrs. Black was very angry. She got on a train and went to see her son. Then she said to him, "Jack, why do you never telephone me?"
Jack laughed, "But, mother, you haven’t got a telephone. "No." She answered, "I haven’t, but you have got one. "

仲裁这种解决纠纷的方式，既不同于民间调解解决纠纷的方式，也不同于诉讼解决纠纷的方式。它的显著特点是(　　)

①自愿性　②民间性　③平等性　④具有快速、灵活的特点