Answer: German- shepherd
Step-by-step explanation:
If I want to find pages that contain the word German but not the word shepherd, the search would achieve this would be German- shepherd.
It should be noted that other options such as German OR shepherd, "GERMAN shepherd" and "German"+"shepherd" all mean that pages containing the words German and also shepherd will be found.
The (-) sign simply means that not. Therefore, the correct option is German - shepherd which means German but not shepherd.