In LTE system, UE initial attachment EPS establish a network, and has been maintained to give UE provides " always-on " of the IP connection, which of the following is the bearer?

In LTE system, UE initial attachment EPS establish a network, and has been maintained to give UE provides " always-on " of the IP connection, which of the following is the bearer?
A . Non-GBR bearer
B . Dedicated bearer
C . Default bearer
D . GBR bearer

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Answer: C