Which statement best describes the differences between Cisco SMARTnet and Cisco SMARTnet Onsite？（）

• A、 CiscoSMARTNet Onsite includes all of the elements of Cisco SMARTnet with the additionalprovision of onsite technician to perform parts replacement
• B、 CiscoSMARTnet Onsite is primarily attractive to customers who do not need to replace theirhardware immediately， but would still like an onsite technician to install and replace hardware
• C、 CiscoSMARTnet Onsite includes certification classes and live network consulting at thecustomer site
• D、 CiscoSMARTnet Onsite provides network monitoring for small-to-medium sized businesses andprovides onsite technical resources when hardware problems are detecteD