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
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