In ladder logic, what does a normally closed (NC) contact represent and how does it affect the coil when its input is false?

In ladder logic, what does a normally closed (NC) contact represent and how does it affect the coil when its input is false?

• A. An NC contact is open when its input is true and closed when false; when closed it can energize the coil.
• B. An NC contact is closed when input is true and energizes coil.
• C. An NC contact is always open.
• D. An NC contact cannot energize the coil.

Answer: (A)