Which of the following statements is true during the establishment of an SCTP connection between an MME and an eNB? (Multiple Choice)

Which of the following statements is true during the establishment of an SCTP connection between an MME and an eNB? (Multiple Choice)
A . A separate stream identifier pair should be reserved, uniquely used for S1AP basic procedures -sending non-UE related signals
B . At least one pair of stream identifiers should be reserved, uniquely used for S1AP basic procedures – when sending ue-related signals, several pairs will be reserved
C . The SCTP connection establishment request is initiated by the MM
E . Sending a separate UE related signal requires an SCTP stream, and the flow is not allowed to change during the process of the UE signal connection.

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Answer: ABD