Which of the following would best prevent unauthorized external changes to an organization's data?

Which of the following would best prevent unauthorized external changes to an organization’s data?

Which of the following would best prevent unauthorized external changes to an organization’s data?
A . Antivirus software, firewall, data encryption.
B . Firewall, data encryption, backup procedures.
C . Antivirus software, firewall, backup procedures.
D . Antivirus software, data encryption, change logs.

Answer: A