How many binary digits are needed to create 1024 combinations? A. 8 B. 9 C. 10 D. 11 Solution C is correct. Ten binary digits provide 1024 combinations (210 = 1024). A, B, and D are incorrect. A is not correct because eight binary digits provide 256 combinations (28 = 256). B is not correct because nine binary digits provide 512 combinations (29 = 512). D is not correct because 11 binary digits provide 2048 combinations (211 = 2048)..