The attached 2 PDF docs indicate the E-Stop and Limits wiring for the C10 BOB from CNC4pc

On the E-Stop PDF it contains two options; one is for "Wiring E-Stop as an input to the controller" and the other option is "Wiring E-Stop as hardware Disable". What each option means and which one I need for my home build cnc?

On the limits PDF, there is one 100 ohms 1/2W resistor on the 5VDC line. What is its purpose and do I need one?