It is possible to force the Hardware Simulator to load a built-in version of chip Xxx. This can be done by: Select one: a. making sure the Xxx.hdl file is not loctaed in the current directory. b. leaving the chip body in the Xxx.hdl file empty. c. stating in the chip header that this is a built-in chip. d. once the chip was implemented by the user, this is not possible.