During a delivery complicated by shoulder dystocia, the baby's head retracts back against the perineum after it emerges, a phenomenon known as 'turtling'. Which of the following is the most appropriate immediate action for the healthcare provider to take?

Apply fundal pressure to help push the baby out.

Use vacuum extraction to assist the delivery of the shoulders.

Wait for the next contraction to try and deliver the shoulders naturally.

Perform the McRoberts maneuver to reposition the mother's legs and widen the pelvis.