A nurse is teaching the parents of an 18-month-old child the procedure for instilling ear drops. How should this procedure be done?a) By cleansing the ear canal before instilling the dropsb) By applying medicated ear wicks after instilling the dropsc) By pulling the pinna up and back after drop instillation to promote dispersement of the dropsd) By pulling the pinna down and back to straighten the auditory canal before instillation of the drops.