Angular strict strictPropertyInitialization - where to init member?

During the initialization of a component I want to retrieve some user information. Now, with the Angular strict mode, I'm not sure where to load this data?

I can think of 3 options. But which is the correct one? Or is there another possibility?

#1 in this option the service method will be called directly on initialization of the userInfo.

export class NavComponent implements OnInit {
  public userInfo$: Observable<LoggedInUser> = this.sessionService.getUserInformation();

  constructor(private sessionService: SessionService) {}

  ngOnInit(): void {}
}

#2 In my opinion it will be better to source this into the constructor like so:

export class NavComponent implements OnInit {
  public isMobileMenuCollapsed = true;
  public userInfo$: Observable<LoggedInUser>;

  constructor(private sessionService: SessionService) {
    this.userInfo$ = this.sessionService.getUserInformation();
  }

  ngOnInit(): void {}
}

#3 in the ngOnInit-method instead of the constructor. But for this solution I need the Definite Assignment Assertion as well:

export class NavComponent implements OnInit {
  public isMobileMenuCollapsed = true;
  public userInfo$!: Observable<LoggedInUser>;

  constructor(private sessionService: SessionService) {
  }

ngOnInit(): void {
  this.userInfo$ = this.sessionService.getUserInformation();
}

}

Which of this possibilties should I use in my code?