在angular 6中选择默认单选按钮

<div *ngFor="let option of options">
  <input type="radio" name="radioGroup" [(ngModel)]="selectedOption" [value]="option">
  {{ option }}
</div>

options: string[] = ['Option 1', 'Option 2', 'Option 3'];
selectedOption: string = 'Option 1';

ngOnInit() {
  this.selectedOption = 'Option 2';
}