A nurse is assessing the symmetry of a client's chest. The nurse should understand that which technique best confirms symmetric expansion of the chest?

Inspection of the shape and configuration of the chest wall during normal breathing

Placing hands sideways posterolateral chest wall with thumbs pointing together at the level of T9 or T10

Percussion of the posterior chest to initiate vibration of the lung structures

Placing the palmar surface of the fingers of one hand against the chest having the client repeat "ninety-nine"