Who directed Harry Potter and the Half-Blood Prince?

When Dumbledore and Harry go to find Horace Slughorn in an abandoned home, what object of furniture is transfigured as to hide?

His invisibility cloak had fallen off of him when petrified

Nothing (put it in to the cauldron whole)

Helena Bonham Carter (Bellatrix Lestrange)

The design was made first for the theme park, so the production design crew (led by Stuart Craig) constructed an exact replica during filming

How well do you know the sixth Harry Potter film, Harry Potter and the Half-Blood Prince?