Right-angled Triangles, SM-Bank 003 MC

Which of the following correctly states Pythagoras' Theorem for this triangle?

1. \(c^2=a^2+b^2\)
2. \(b^2=c^2-a^2\)
3. \(a^2=b^2+c^2\)
4. \(b^2=a^2+c^2\)