What are the 3 meanings of the title "Fall of the House of Usher?"

1) At the end of the story the house (mansion) falls into the water.

2) Roderick and Madeline were the last surviving member of the family. Thus, the Usher line ended (fell) with their deaths.

3) Roderick literally falls (along with his sister) to the ground when he dies.

Note: You only need to post your questions once.

What is the meaning of the story?