An employee has reported that their company-issued smartphone has been receiving an inordinate number of ads as push notifications, and some apps appear to be behaving unexpectedly, including requesting permissions that are not relevant to their functions. Which of the following actions BEST addresses the root cause of these symptoms?
Disable unnecessary services and applications on the smartphone to reduce the attack surface.
Review the source of app installations on the device and uninstall any apps that were not installed from the official app store.
Update the device's antivirus software to the latest definitions and perform a full system scan.
Review the app vendor's official documentation for any notes on required permissions and app behavior.