In an exam I see a question:

Which one of the following is true?

- For a binary search, the best-case occurs when the target item is in the beginning of the search list.
- For a binary search, the best-case occurs when the target is at the end of the search list.
- For a binary search, the worst-case is when the target item is not in the search list.
- For a binary search, the worst-case is when the target is found in the middle of the search list.

Well in my point of view both **1.** and **3.** are correct but it's only asking for one option. What am I missing?