Which components are essential parts of a therapeutic robotics system used in rehabilitation?

• A. Visual design and branding; packaging; supply chain; marketing.
• B. Sensing (position/force); actuation (motors/ actuators); control (embedded algorithms, feedback control); safety (emergency stop, limit switches, fault detection).
• C. Data storage, cloud computing, social media integration, analytics.
• D. Battery chemistry only; weight and cost; nothing about sensing.

Answer: (B)