When configuring Cisco Unified Communications Manager to use Busy Lamp Field Speed Dials as a native presence feature, which function is required?
A. Enable the "BLF for Call Lists" in the Enterprise parameter section.
B. Enable the "BLF for Call Lists" in the Cisco CallManager service parameter section.
C. Enable the "BLF for Call Lists" in the Cisco Unified Presence Server.
D. Do nothing; the "BLF for Call Lists" is enabled by default.
