The Boolean equation for a NOR function is:

• A. <img src="/_files/images/digital-electronics/digital-systems/mca3_1020a1.gif">
• B. <img src="/_files/images/digital-electronics/digital-systems/mca3_1020b1.gif">
• C. <img src="/_files/images/digital-electronics/digital-systems/mca3_1020c1.gif">
• D. <img src="/_files/images/digital-electronics/digital-systems/mca3_1020d1.gif">