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What is the role of services in AngularJS and name any services made available by default?
Options:
A .  AngularJS Services are objects that provide separation of concerns to an AngularJS app.
B .  These can be created using a factory method or a service method.
C .  Services are singleton components and all components of the application (into which the service is injected) will work with single instance of the service
D .  All of the above
Answer: Option D
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