Which of the following statements is/are correct?

1. For United States of America, hurricane Katrina was the costliest natural disaster ever.
2. It occurred in the year 2005.
3. It was a Category 5 hurricane, 5 being the highest category obtainable by a tropical cyclone throughout its journey beginning at Bahamas.

Hurricane Katrina was the deadliest and most destructive Atlantic hurricane of the 2005 Atlantic hurricane season. It was the costliest natural disaster as well as one of the five deadliest hurricanes in the history of the United States. Hurricane Katrina formed over the Bahamas on August 23, 2005 and crossed southern Florida as a moderate Category 1 hurricane, causing some deaths and flooding there before strengthening rapidly in the Gulf of Mexico. The hurricane strengthened to a Category 5 hurricane over the warm Gulf water, but weakened before making its second landfall.