Joe, a Mobile Device User, Reached His Monthly Quota of Data

Joe, a mobile device user, reached his monthly quota of data about halfway through the current billing cycle. Joe contacts a technician to identify potential issues with the mobile device, as his usage patterns have not changed over the past month. Which of the following is MOST likely causing this issue?

A) There are unintended WiFi connections.
B) Location tracking has been enabled.
C) Applications are causing high resource utilization.
D) Malware is causing excessive data transmission.