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What service is offered by system applications?

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What service is offered by system applications?

(a) Interaction services

(b) Information services

(c) Intra-system communication

(d) Media dependent services

This question was posed to me by my college director while I was bunking the class.

The above asked question is from Architecture in portion Cognitive Radio Architecture of Cognitive Radio

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The correct option is (b) Information services

Easy explanation: System application offers information services of value to the user. It is responsible for providing the applications such as phone book, text messaging, networking, and gaming, etc. It is also responsible for hiding information that is not primarily important for a user such as the technology being used for communication.

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