Which of the following is an example of biomimicry that has been used to solve a real-world problem?

Dissecting polar bear feces to formulate a protocol for increasing the world's overall food supplies
Modeling the blades of wind turbines after humpback whale flukes to reduce drag and stalling
Studying the reproductive behaviors of crustaceans to better understand human reproduction
Using migration patterns of pelagic fish to create more realistic topographical maps of the oceans