Question from the Angular test

@Component({ ... })
export class AppComponent{
  constructor(private route: ActivatedRoute){
     const id = route.snapshot.paramMap.get('id');
  }
}

@Component({ ... })
export class AppComponent{
  constructor(private route: Router){
     const id = route.snapshot.paramMap.get('id');
  }
}

@Component({ ... })
export class AppComponent{
  constructor(private route: ActivatedRoute){
     const id = route.paramMap.get('id');
  }
}

@Component({ ... })
export class AppComponent{
  constructor(private route: Router){
     const id = route.paramMap.get('id');
  }
}