The logic expression for a NOR gate is ________.

• A. <img src="/_files/images/digital-electronics/digital-fundamentals/mca3_0140a.gif">
• B. <img src="/_files/images/digital-electronics/digital-fundamentals/mca3_0140b.gif">
• C. <img src="/_files/images/digital-electronics/digital-fundamentals/mca3_0140c.gif">
• D. <img src="/_files/images/digital-electronics/digital-fundamentals/mca3_0140d.gif">