Which Instant Messaging proxies are available on the ProxySG?

Which Instant Messaging proxies are available on the ProxySG? (Choose all that apply)

(a) AIM
(b) Jabber
(c) MSN
(d) Yahoo

A.
a, b & c only

B.
a, b & d only

C.
A. c & d only

D.
b. c & d only

E.
All of the above

Explanation: