Consider the following statements about in-situ and ex-situ conservation:

I. In-situ conservation involves protecting species within their natural habitats, such as in national parks and wildlife sanctuaries.

II. Ex-situ conservation involves protecting species outside their natural habitats, such as in zoological parks and botanical gardens.

III. Ex-situ conservation is always a better strategy than in-situ conservation for preserving biodiversity.

Which of the statements given above is/are correct?