Three closures are appended inside for index in 0..<3 and invoked after the loop. Which c…

Three closures are appended inside for index in 0..<3 and invoked after the loop. Which capture description is correct?

1. Each closure retains its iteration binding, so the values are 0, 1, and 2.
2. All closures share one loop binding, so every value is 2.
3. Capturing an iteration binding is forbidden unless [index] is present.