You are a nurse caring for a 10-year-old child diagnosed with Duchenne Muscular Dystrophy (DMD). The child is experiencing difficulty with walking and frequent falls. What is the most appropriate nursing intervention to promote mobility and prevent falls for this patient?

Advise the use of a wheelchair at all times to prevent falls.

Encourage regular physical therapy sessions focusing on strengthening exercises.

Increase calcium and vitamin D intake to improve muscle strength.

Limit physical activity to prevent muscle fatigue and protect from injury.