The correct answer is 1. Athetoid movements are involuntary slow, irregular, and writhing, which make it difficult to maintain a static body position.
Spastic CP is the most common type, characterized by muscle stiffness and tightness.
Ataxic CP is characterized by problems with balance and coordination
Clasped knife refers to a specific type of muscle resistance observed in individuals with certain types of cerebral palsy (CP), but it is not a separate type of CP but rather a descriptive term used to explain a particular type of muscle tone response.