Identify the Letter of the Choice That Best Matches the Phrase

Identify the letter of the choice that best matches the phrase or definition.
-Delivers support for full high-definition videoconferencing

A) cloud computing
B) Click-to-Run
C) Office on Demand
D) Exchange Online
E) Active Directory Synchronization
F) instant messaging
G) Lync
H) SharePoint Calendar
I) SharePoint Task List
J) SharePoint Contacts List