Question from the Kotlin test

constructor(name: String, parent: Person) {
    this(name)
    parent.children.add(this)
}

constructor(name: String, parent: Person) : this(name) {
    parent.children.add(this)
}

constructor(name: String, parent: Person) {
    this.name = name
    parent.children.add(this)
}

constructor(name: String, parent: Person) {
    super.name = name
    parent.children.add(this)
}