Which statement differentiates digital input from analog input on a PLC?

Which statement differentiates digital input from analog input on a PLC?

• A. Digital inputs are discrete on/off signals; analog inputs are continuous (4-20 mA, 0-10 V)
• B. Analog inputs are discrete on/off signals; digital inputs are continuous signals
• C. Digital inputs require no power; analog inputs require power
• D. Digital inputs are always less accurate than analog

Answer: (A)