Why should a customer consider buying HP IP phones for their HP Lync deployment?

A.
Their rich feature set includes hands-free audio quality.

B.
Their LED indicators provide ease-of-use operation.

C.
They are Lync-optimzed for seamless plug-and-play ability.

D.
They are the only phones the solution supports.

Explanation:
Reference: http://h30507.www3.hp.com/t5/HP-Networking/Why-would-I-choose-HP-IP-phonesoptimized-for-Microsoft-Lync/ba-p/99467#.UY9y2isS29w (see ‘why would I purchase an IP phone
optimized for Microsoft Lync from HP’)