Which Two Factors Determine Which Call Will Be Routed Via

Which two factors determine which call will be routed via the "Last Agent" element? (Choose two.)

A) If the Caller know the extension number of the Agent
B) How long ago the agent spoke to the caller
C) Minimum contact time during the last conversation with the agent
D) The Last Agent available in the group
E) If the Customer in is the Agents personal contacts list