I understand the first part which is the four variables map. Can someone please explain to me how to solve the second part? Thanks

1-11. Simplify following Boolean function in sum-of-products form by means the of four-variable map. Draw the logic diagram with (a) AND-OR gates; (b) NAND gates. FCA, B, C, D) s (0,2, 8, 9, 10, 11,14, 15) Solution 00 01 11 10 DODo NOT COUNTED