Regarding the Qos architecture of EPS, which of the following statements is incorrect?

Regarding the Qos architecture of EPS, which of the following statements is incorrect?
A . The EPS system only covers the Qos demand of the traffic in the EPS, that is, the range between the UE and the P-G
C . The EPS system changes the principle of controlling the bearer Qos by the network side in the GPRS system, and the UE controls the bearing Qos to realize the transmission and control of the service flow.
D . The EPS system simplifies the original Qos parameter system and uses the standardized Qos classification identifier QC
F . The default bearer in the EPS is a Non-GBR bearer, and the proprietary bearer can be a GBR bearer or a Non-GBR bearer.

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Answer: B