正解:A
In the context of NETCONF (Network Configuration Protocol), XML strings are used to encapsulate and structure the data being exchanged between a client and a server. The XMLstring provided in the question is part of a NETCONF message, which should be properly closed to ensure that it is well-formed and can be processed correctly. The correct answer is option A, "</rpc>]]>]]>", which signifies the end of an RPC (Remote Procedure Call) message in NETCONF. This specific ending sequence includes the closing </rpc> tag followed by "]]>]]>", which is used to mark the end of the content section in a NETCONF message.