Which of the following technologies is specifically designed to increase server virtualization performance？（）

A.SAS
B.SATA
C.Flash
D.SCSI

A.NTP
B.SNMP
C.SMTP
D.RAS

A. A physical server environment utilizing only RAM storage with no physical disk medium to enhance performance.
B. Multiple operating systems sharing the same physical hardware to leverage higher usage.
C. A distributed computing environment where many lower cost machines are combined to increase processing power and overall performance.
D. A single operating system using multiple physical hardware chassis to leverage higher availability.