Using immutable data structures in Angular provides benefits like more efficient data binding. Immutable data structures prevent unexpected changes to the data, making it easier to track changes in the application state. They also help optimize change detection, leading to better performance. While the other options may have their merits, they do not directly address the benefits of immutability in Angular.

In template-driven forms, you can access the overall form status by utilizing the 'form' property in a template. This 'form' property provides information about the form's status, such as whether it's valid, invalid, or pristine. It's a built-in feature for managing and validating forms in Angular.

The lifecycle hook ngAfterViewInit is specifically related to a component's child template. This hook is called after Angular has fully initialized a component's view and any child views it contains. It allows you to interact with the template and its elements once they are ready for manipulation.

The 'CanActivate' Route Guard is used to check whether a user can activate a particular route. It's commonly used for protecting routes based on authentication or other conditions. This guard determines if a user has permission to access a specific route and is typically used to secure routes in Angular applications. The other guards have different roles, such as 'CanActivateChild' for protecting child routes and 'CanDeactivate' for confirming navigation away from a component.

When making an HTTP request using HttpClient, an Observable object is returned. Observables are used to handle asynchronous data streams and provide features like error handling and transformation, making them well-suited for managing HTTP responses.

In Angular, to define routes for an application, you typically create an array of Route objects. These objects define the mapping between routes and components, specifying which component should be displayed when a particular route is navigated to. The RouterModule is indeed used to set up the routing configuration in an Angular application, but it's not an array. Components and modules are essential parts of Angular, but they are not used directly to define routes.

It is recommended to use immutable data structures with the "OnPush" change detection strategy because immutable data structures help avoid side effects. In Angular, when you change an input property's value, it triggers change detection. Using mutable objects can lead to unintended changes and unexpected behavior. Immutable data structures ensure that once a value is set, it remains unchanged, making it easier to reason about component behavior and performance optimization.

These lifecycle hooks, ngAfterViewInit and ngAfterViewChecked, are related to a component's view rendering process in Angular. ngAfterViewInit is called after the view and its child views (if any) have been initialized, and ngAfterViewChecked is called after every check of the component's view and child views. These hooks allow developers to perform actions after the view has been created or updated.

In Angular, when creating custom form controls, the method used to write a new value to the view is setValue(). This method allows you to set the value of a FormControl and update the view accordingly. It's a critical method for working with form controls in Angular.

To accommodate the client's requirement of deep linking to specific parts of your Angular application, you should use Angular's RouterModule and configure the application for hash-based routing. This approach allows for deep linking by using URL fragments. The other options are not suitable for achieving deep linking in an Angular application.