Identify the Letter of the Choice That Best Matches the Phrase

Identify the letter of the choice that best matches the phrase or definition.
-The practice of sharing or pooling computing resources, such as servers

A) virtualization
B) mobile operating system
C) Blackberry
D) sleep mode
E) hibernate
F) administrator account
G) user name
H) password
I) Google Play
J) permissions
K) thrashing
L) NFC
M) Passbook
N) command language
O) Wallet
P) SkyDrive
Q) Linux
R) antivirus
S) iCloud
T) account