What is a sleeper hit?

A、A piece of media (like a film, album, or book) that becomes a failure despite high expectations
B、A piece of media (like a film, album, or book) that becomes a big success despite low expectations
C、A piece of media (like a film, album, or book) that becomes a failure despite high costs
D、A piece of media (like a film, album, or book) that becomes a success because of high costs