When Scientists Say That "Black Holes Have No Hair", What

When scientists say that "black holes have no hair", what do they mean?

A) that the event horizon of a black hole is very smooth and does not have parts that jut out
B) that if you threw something toward a black hole (a rabbit, say) it would quickly be ripped apart into smaller pieces
C) that time near a black hole slows down so much our hair would not grow at a normal rate
D) that once a black hole forms, very little information can be extracted from it about the material that is now inside
E) no one knows what this means; regular people are not meant to figure out some of the weird things physicists say about black holes