How to use the ngModel directive in Angular?

Question

What is the code equivalent to the `<input [(ngModel)]="userName" />` syntax?

Accepted Answer

`<input [ngModel]="userName" (ngModelChange)="userName = $event" />`

Answer

`<input [ngModel]="userName" (ngModel)="userName = $event" />`

Answer

`<input [ngModel]="userName" (ngModel)="userName = $event.target.value" />`

Answer

`<input [ngModel]="userName" (ngModelChange)="userName = $event.target.value" />`

Question from the Angular test