Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to detect and remove keyloggers [title] Ensure the system is fully protected from any known vulnerabilities. [step] Update your operating system as well as your applications. Outdated software may have exposed security holes that can open your computer up to infection.

Ending1: Update your system for anything which might be sensitive, such as password shortcuts, gst updates or anti-virus updates. [substeps] Scan your system as often as possible until you see anything that can aid in removing keyloggers. Ending2: [title] Make sure that all users of the computer know not to click freely on the internet, especially pop-ups, and avoiding freebies at all costs. [title] Guarantee that the browser used is configured securely. Ending3: Learn what updates are and exactly where repairs are to be made. [title] Refer to your user's manual for manual updates. Ending4: Popular easy to detect methods include the following : [substeps] Fraud and identity theft to identify and remove any hackers and to disable or disable sensitive access to your computer. Treatment of phishing or computer software that is dishonest or misuses assets.

Answer format: ending1/ending2/ending3/ending4