A hospital CIO tells the network architect that the current network solution is not performing well. The hospital has access layer switches that support 4810/100/1000 Mbps ports and one Gigabit uplink. The hospital is seeking an upgrade to provide better performance and redundancy.
The CIO cannot provide network architect more detailed information about traffic patterns and utilization but does not want the network architect to install intelligent Management Center (IMC) and analyze the traffic.
The CIO does indicate that these applications are important:

Voice over IP (VoIP)

Scheduling and billing application

Patient data logging

Medical imaging

The network architect needs to plan an appropriate oversubscription ratio for access layer uplinks.
What is one piece of information that the architect should collect for this task?