The correct answer is option 4, which states that all of the above statements are correct.
To further explain each statement:
- Option 1 is correct because Pluto was reclassified as a "dwarf planet" by the International Astronomical Union (IAU) in 2006, hence it is not considered a planet anymore.
- Option 2 is correct because Clyde Tombaugh did discover Pluto in 1930 while he was working at the Lowell Observatory in Arizona.
- Option 3 is correct because Pluto has been assigned the number 134340 by the Minor Planet Center, which is responsible for naming and cataloging astronomical bodies.
Therefore, option 4 accurately summarizes that all the statements mentioned are correct.