How many premium seats should you purchase?

You are designing a Cisco Unified Contact Center Express system with these four requirements

• 250 configured agents

• a maximum of 150 agents that are logged in at any time

• 30 agents that are able to make outbound calls

• 20 agents that are able to answer emails

How many premium seats should you purchase?
A . 150
B . 200
C . 180
D . 250