Consider the following observations regarding the physics involved in playing a flute:
- A flute player changes the pitch of the sound produced by opening and closing holes in the body of the flute.
- Opening and closing of holes in the body of a flute changes its resonant frequency.
- The pitch of the sound produced by a flute cannot be changed without opening and closing holes in the body of the flute.
Which of the above statements is/are correct?