A landlord is renting out an apartment and has three prospective tenants. The first tenant is willing to pay $1200/month, the second tenant is willing to pay $3000/month, and the third tenant is willing to pay $2000/month. Each potential tenant knows the valuations of the other tenants. Of the following methods of renting the apartment, which would generate the greatest revenue?
A sealed first-price auction
A sealed second-price (Vickrey) auction
A fixed price of $1900/month
A fixed price of $2200/month