Which output expression might indicate a product-of-sums circuit construction?

• A. <img src="/_files/images/digital-electronics/basic-digital-electronics/mca5_1023a1.gif">
• B. <img src="/_files/images/digital-electronics/basic-digital-electronics/mca5_1023b1.gif">
• C. <img src="/_files/images/digital-electronics/basic-digital-electronics/mca5_1023c1.gif">
• D. <img src="/_files/images/digital-electronics/basic-digital-electronics/mca5_1023d1.gif">