You are given a paragraph, a question and some answer options (associated with "A", "B", "C", "D", etc.) You need to list all the correct answer options with their associated letters (e.g. "A" can be a valid answer). Note that sometimes, more than one option can answer the question correctly and completely. In those cases, please generate all such options separated by a comma (e.g. "A, B" is a valid answer). Do not generate anything else apart from one or more of the following characters: 'A', 'B, 'C', 'D', etc.

Paragraph- Sent 1: LONDON, England -- Graffiti artist Banksy, famed for infiltrating museum collections without their knowledge and spray-painting public buildings around the world, is holding his first major exhibition in years.
Sent 2: A Banksy painting of the British House of Commons at England's Bristol museum.
Sent 3: This time, however, the anonymous artist worked in tandem with the director of Bristol museum in the UK.
Sent 4: CNN's Max Foster got a preview of his largest project to date.
Sent 5: The artist's anonymity gained him notoriety and he became one of the art world's biggest names with his works selling at auction for hundreds of thousands of dollars.
Sent 6: The exhibition's range, while very varied, remained true to Banksy form with his usual unconventional take on art.
Sent 7: See pictures from Banksy's exhibition " "I think we might have dragged them down to our level rather than being elevated to theirs" Banksy, who is thought to be from Bristol, said about the museum.
Sent 8: He filled three stories of the building with his art in 36 hours under tight security, as only a few museum staff were aware of the shows' imminent arrival.
Sent 9: His work is hidden among the museum's usual exhibits and is split into different rooms, including installations, paintings and sculptures.
Sent 10: In one of the paintings, a character has been cut out and is instead sitting on the painting's frame, perhaps taking a break from posing?.
Question: How long did it take Banksy to hide his work among three stories of the museum's usual exhibits? (A) 36 hours (B) Three Stories (C) 24 hours (D) 2 days (E) 18 hours.
A.