The correct answer is C. Configuring automatic software updates. Automatic updates help keep the operating system and applications patched against known security flaws. This is proactive because it reduces exposure before an attack occurs. Cloud backup helps with data recovery, but it does not directly prevent online threats.
Updating subscription software may help in some cases, such as antivirus software, but the broader and stronger proactive security measure is automatic software updates. Installing remote access software can increase risk if it is not properly secured.
Exact Extract/Reference: The Tech+ Study Guide states that device hardening "starts with keeping the software up-to-date" and lists patching software as a security-hardening action. It also warns that some updates address "critical security flaws" and that ignoring them can make a PC vulnerable to Internet-based attacks.