A user within the organization is consistently receiving data-usage limit notifications on their mobile device towards the end of each billing cycle. The IT policy enforces restrictions on streaming media and large downloads over cellular data. The employee confirms adherence to these policies and there have been no new applications installed. What is the MOST likely reason for these notifications and what should the technician investigate FIRST?
Perform an immediate update of all applications on the device, assuming that outdated apps are causing the excess data usage.
Conduct a thorough malware scan, suspecting a malware infection is the cause of increased data usage.
Enforce a stricter data plan for the user's device to prevent them from exceeding the organizational data-usage limit.
Investigate detailed cellular data usage in the device settings to identify which applications or services are using the most data.