Cari is a system administrator for an organization that has been seeing large amounts of growth but has multiple legacy systems running on older hardware. There is a concern that there is not much physical space left in the data center. Her manager has asked her to come up with a way that the company could continue to expand the ability to deliver services to end users without having to grow into another data center. Which of the following might be a component of Cari's plan?
a. VPN b. MTBF c. Hypervisor d. Leased Line