Company A uses an outside vendor for support of its internal network. Company B's networking equipment is housed in a datacenter in another country. Company C has an internal network infrastructure…

Company A uses an outside vendor for support of its internal network. Company B's networking equipment is housed in a datacenter in another country. Company C has an internal network infrastructure, but its software runs from an on-demand self-service third-party datacenter. Company D uses its own IT staff to support an internal network. Which of the following companies MUST be using cloud computing?