Which server role should you deploy to the network?

Note: This question is part of a series of questions that use the same scenario. For your convenience, the scenario is repeated in each question. Each question presents a different goal and answer choices, but the text of the scenario is exactly the same in each question in this series.
Start of repeated scenario.
Your company has a marketing department.
The network contains an Active Directory domain named constoso.com. The domain contains the servers configured as shown in the following table.

All servers run Windows Server 2016. All client computers run Windows 10 and are domain members. All laptops are protected by using BitLocker Drive Encryption (BitLocker).
You have an organizational unit (OU) named OU1 that contains the computer accounts of application servers. An OU named OU2 contains the computer accounts of the computers in the marketing department. A Group Policy object (GPO) named GP1 is linked to OU1. A GPO named GP2 is linked to OU2,
All computers receive updated from Server1.
You create an update rule named Update1.
End of repeated scenario.
You need to implement BitLocker Network Unlock for all of the laptops. Which server role should you deploy to the network?
A. Host Guardian Service
B. Device Health Attestation
C. Windows Deployment Services
D. Network Controller