You are tasked with securing a small network for a client in which the following requirements must be met:
• If a user on the private network attempts to send confidential company information to an unauthorized entity, an alert should be triggered.
• The private trusted network should not be accessible from the public untrusted network.
• If attacks are coming from the external network, the system should detect and prevent malicious activity.
• All incoming and outgoing email should be scanned for malware.
  
Which of the following would best meet the requirements of the client?

A. Implement a firewall.
B. Implement an IPS.
C. Implement a UTM appliance.
D. Implement identity-based ACLs.
E. Implement an IDS.

Answer: C