A user calls a technician regarding an iOS mobile device that is having problems with standby time after a new update was applied. The technician verifies no new applications were installed since the update, but the device still has poor standby time even after the update is removed. Which of the following is the MOST likely cause of the issue?
A. Zero-day malware
B. Safari code injection
C. OS corruption
D. Overheating
E. Time sync failure
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