Which Angular feature guarantees that a service instance is shared application-wide without manual provider configuration?

easy🧠 Conceptual Q1 of 15

Angular - Services and Dependency Injection

AUsing <code>@Injectable({ providedIn: 'root' })</code>

BAdding the service to the <code>providers</code> array of every component

CDeclaring the service inside a component's <code>providers</code> array

DCreating a new instance of the service in each component constructor

Step-by-Step Solution

Solution:

Step 1: Understand Angular's providedIn
The providedIn: 'root' option in the @Injectable decorator tells Angular to provide the service in the root injector.
Step 2: Effect of root injector
Services provided in the root injector are singletons shared across the entire app.
Final Answer:
Using @Injectable({ providedIn: 'root' }) -> Option A
Quick Check:
Root injector provides singleton service [OK]

Quick Trick: Use providedIn: 'root' for app-wide singleton [OK]

Common Mistakes:

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