Response message "lxx", indicating?

exams H11-861_V2.0-ENU V1 H11-861_V2.0-ENU exam 0 Comments

Response message "lxx", indicating?
A . Indicates that the request message contains a syntax error or the SIP server cannot complete the processing of the request message
B. Further action shall be taken to complete the request
C. Indicates that the request cannot be fulfilled on any SIP server
D. Indicates that the request message has been received and is being processed

Answer: D