When trying to focus an object on the microscope, you always begin with the ________________ objective lens and use __________________ adjustment knob to bring the object in focus.  Once object is focused, high power objective lens can be used to magnify the object, and only use the ___________________ adjustment knob to focus at this point.     a scanning; coarse; fine   b low power; coarse; fine   c low power; fine; coarse   d scanning, fine; coarse

When trying to focus an object on the microscope, you always begin with the ________________ objective lens and use __________________ adjustment knob to bring the object in focus.  Once object is focused, high power objective lens can be used to magnify the object, and only use the ___________________ adjustment knob to focus at this point.