Which of the following lines correctly replaces the missing line to safely assign “Welcome” to messages[0] only if it is currently null?

public class InitializeObjectArray {
    public static void main(String[] args) {
        String[] messages = new String[3];
        // Missing line: Safely assign "Welcome" to the first element if it is null.
        if(messages[0] == null){
            messages[0] = "Welcome";
        }
        System.out.println(messages[0]);
    }
}