Bradley is a six-year old with spastic cerebral palsy characterized by quadriplegic hemiparesis, ...

Bradley is a six-year old with spastic cerebral palsy characterized by quadriplegic hemiparesis, poor posture, and poor head control.
 
  His speech is characterized by severe spastic dsysarthria which makes him unintelligible to unfamiliar listeners 90 of the time. Bradley demonstrates the cognitive and academic skills of a first grader and he and his parents are anxious for him to be placed in a regular classroom. Bradley requires an AAC system that will allow him to communicate spontaneously with his teachers and peers. Based on Bradley's motor, cognitive, academic and social needs, the speech-language pathologist selects an
  a) Aided symbol system
  b) Unaided symbol system
  c) Aided symbol set
  d) Unaided symbol set