Which of the following descriptions is wrong during the establishment of an SCTP connection between an MME and an eNB?

Which of the following descriptions is wrong during the establishment of an SCTP connection between an MME and an eNB?
A . At least one pair of stream identifiers should be reserved, uniquely used for the S1AP basic procedure-sending UE related signals. Usually keep a few pairs.
B . A separate stream identifier pair should be reserved, uniquely used for the S1AP basic procedure-sending non-UE related signals
C . Sending a separate UE related signal requires an SCTP stream, and the flow is not allowed to change during the UE signal connection.
D . The SCTP connection establishment request is initiated by the MM

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Answer: D