Which of the following descriptions are correct? (Multiple Choice)

Which of the following descriptions are correct? (Multiple Choice)
A . The object of EPS session management is EPS bearer
B . The EPS provides an IP connection between the UE and the PDN through the E-UTRAN network and the EPC network for UE, which is called a PDN connection. Each PDN connection consists of an EPS bearer and an IP connection.
C . EPS bearer is defined as a logical set of one or more Service Data Flows (SDFs) to meet the needs of QoS management and control at a bearer level granularity.
D . When the UE is connected to the PDN, an EPS bearer is established. This bearer is not released during the PDN connection to provide a permanent connection to the PD
E . This bearer is called the default bearer. All additional EPS bearers to the PDN are called dedicated bearers.
F . The default bearer and dedicated bearer under a PDN connection generally correspond to different APNs.

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Answer: ABCD