Which statement about move || println!("{label}") is correct when label is a String?

Which statement about move || println!("{label}") is correct when label is a String?

1. It captures label by value but can still implement Fn because the body only reads it.
2. Every move closure implements only FnOnce.
3. It copies the String bytes into a second allocation on every call.
4. It borrows label and therefore cannot leave the defining block.