With regard to proprietary bearer release, which of the following is correct?

With regard to proprietary bearer release, which of the following is correct?
A . The EPS bearer ID is still valid after the release of the proprietary bearer
B . RRC reconfiguration message bearer, proprietary bearer release accept message
C . The proprietary bearer release coincides with the default bearer release
D . The network can release the proprietary bearer separately

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Answer: B