What is the pu

What is the purpose of the NBAR protocol discovery？（）

• A、to build a Packet Description Language Module （PDLM） file to be used in protocol matching
• B、to discover applications and build class maps for data classification
• C、to look into the TCP or UDP payload and classify packets based on the content
• D、to build a database of all application data that passes through the router and queue the data accordingly