What type of circuit is represented in the given figure, and which statement best describes its operation?

• A. It is a tristate inverter. When the ENABLE input is HIGH, the output is effectively an open circuit it is neither LOW nor HIGH.
• B. It is a programmable inverter. It can be programmed to function as either an active LOW or an active HIGH inverter.
• C. It is an active LOW buffer, which can be turned on and off by the ENABLE input.
• D. None of the above.