Identify the Letter of the Choice That Best Matches the Phrase

Identify the letter of the choice that best matches the phrase or definition.
-You should run exactly one of this kind of application on your computer

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