Which set of intervals is called perfect?

Question

(1 point)
Responses

2nd, 3rd, 6th
2nd, 3rd, 6th
4th, 5th, octave
4th, 5th, octave
3rd, 6th, 7th
3rd, 6th, 7th
2nd, 5th, 7th

Answer 1

4th, 5th, octave