With reference to gravitons and the gravito-phononic effect, consider the following statements:

1. The graviton is a hypothetical quantum particle proposed as the carrier of the gravitational force, analogous to the photon in electromagnetism.

2. Gravitational lensing refers to the bending of light from distant objects due to the gravitational field of massive bodies, as explained by general relativity.

3. The gravito-phononic effect describes discrete energy transfer from gravitational waves or gravitons to phonons in a quantum system.

4. A phonon is a quantised vibration of a mechanical or acoustic system.

5. Modern phonon-counting techniques may enable the detection of individual energy transitions in such systems.

Which of the statements given above are correct?