Answer:
Human resources
Step-by-step explanation:
As an information security officer, I need to establish a vendor risk management process. I will have to engage
Procurement - because that department is directly involved in purchasing and dealing with vendors.
Legal - as I am looking to implement a risk management process, a legal department will help out defining the policy and to avert any lawsuits or government systems
Vendor Management - Because that group is directly dealing with vendors for their registration and other processes.
Human resource is not engaged because we are not looking for new manpower for HR to hire / recruit which makes them irrelevant.