Which statement best describes the differences between Cisco SMARTnet and Cisco SMARTnet onsite?

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Which statement best describes the differences between Cisco SMARTnet and Cisco SMARTnet onsite?

A. Cisco SMARTnet Onsite includes all of the elements of Cisco SMARTnet, with the additional provision of onsite technician to perform parts replacement
B. Cisco SMARTnet Onsite is primary attractive to customers who do not need to replace their hardware immediately, but would still like an onsite technician to install and replace hardware
C. Cisco SMARTnet Onsite includes certification classes and live network consulting at the customer site
D. Cisco SMARTnet Onsite provides network monitoring for small-to-medium sized businesses and provides onsite technical resources when hardware problems