I see that now. Pressing the AF button on the D4 and using the rear wheel gives settings of AF-C or AF-S. Selecting AF-C and then turning the front wheel gives settings of S, d9, d21, d51, 3D, and Auto.
If AF-C gives Continuous --- I thought with D9, etc you get continuous focusing within those focus points. I had never thought about what you get with AF-C, "S". What do you get with AF-C .... S?