Which of the following error sub-codes can be contained in this OPEN message?

A Notification message with Error Code 2 indicates an error OPEN message.

Which of the following error sub-codes can be contained in this OPEN message?
A . 1: indicates that the version number is not supported.
B . 2: indicates that the AS of the peer is incorrect.
C . 3: indicates that the BGP identifier is incorrect.
D . 4: indicates that the Optional Parameters filed is not supported.

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Answer: ABCD