In a PLC, which statement best describes analog I/O versus digital I/O?

In a PLC, which statement best describes analog I/O versus digital I/O?

• A. Analog I/O handles continuous signals (0-20 mA, 4-20 mA, 0-10 V); digital I/O handles discrete on/off states (0 or 1).
• B. Analog I/O handles discrete on/off states; digital I/O handles continuous signals.
• C. Analog I/O uses only voltage; digital I/O uses only current.
• D. Analog I/O and digital I/O function identically; there is no difference.

Answer: (A)