Vaughn is calculating the volume of the cylinder below using the following work.

A cylinder with height of 24 centimeters and diameter of 5 centimeters. What was Vaughn’s first error?

1) He confused the height and the diameter.
2) He squared 12 instead of 24.
3) He applied the exponent before multiplying 12 and 5.
3) He used the wrong units in his final answer.