When using Cisco Unified Communications Manager Express in SRST mode, how many multicast music on hold streams can be utilized by the system at any given time?

A.
3

B.
6

C.
2

D.
4

E.
1

F.
5

Explanation:
Ok, see 2-86 or 3-21
Each SRST or Cisco Unified Communications Manager Express router can stream up to six different MOH files.
6 moh. 5 additional + 1 default (thanks to alex_voyager)