Which of the following is a way to prevent downloading malicious code?

Scanning external files before uploading them to your device is an effective measure to prevent downloading malicious code. This process allows you to analyze files for any signs of malware or harmful content before they can affect your system. By utilizing antivirus software or other security tools, you can identify and eliminate potential threats, significantly reducing the risk of infection from external sources.

In contrast, enabling automatic downloads could actually increase the likelihood of inadvertently downloading malicious content, as files might be saved without your knowledge or consent. Using outdated software leaves you vulnerable to known security flaws, as updates often include crucial patches to protect against malware. Lastly, ignoring app reviews can lead to the installation of applications that may carry hidden malware or security issues and jeopardize your system's integrity.