What does this program print?

What does this program print?

fn main() {
    let mut values = vec![10, 20, 30];
    let first = &values[0];
    println!("first: {first}");
    values.push(40);
    println!("values: {values:?}");
}

1. first: 10 / values: [10, 20, 30, 40]
2. It fails because every reference lasts to the closing brace.
3. first: 40 / values: [10, 20, 30, 40]
4. It panics when push reallocates the vector.