Which statement is true about how robots are controlled?

• A. They always use speech-based commands
• B. They are never controlled with visual interfaces
• C. Several methods exist, including pendants, remote controls, and speech
• D. Only telepathic interfaces exist

Answer: (C)

Robots are controlled through a variety of interfaces, not just one method. The statement that several methods exist, including pendants, remote controls, and speech, captures how human–robot interaction works in practice. A pendant or joystick lets you guide motion precisely when a task requires tactile control; a wireless remote is handy for directing a robot from some distance; speech commands enable hands-free interaction, especially in service or home environments. Many systems actually support more than one method, allowing operators to choose the best interface for the current task or to switch between interfaces as needed. Options that imply only one method—like only speech or only telepathic interfaces—don’t reflect how robots are typically controlled in real-world settings.