USB HIDBP Keyboard (basic) support CONFIG_USB_KBD Say Y here only if you are absolutely sure that you don't want to use the generic HID driver for your USB keyboard and prefer to use the keyboard in its limited Boot Protocol mode instead.
This is almost certainly not what you want.
This code is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called usbkbd.o. If you want to compile it as a module, say M here and read <file:Documentation/modules.txt>.