A user reports that their smartphone battery is draining much more quickly than normal, the device is overheating, and there are unfamiliar applications installed. The user admits to recently downloading an app from a third-party website. Which of the following is the MOST likely explanation for these issues?
The device is in need of an OS update to fix the battery life bug.
The device has probably been infected with malware from the third-party app installation.
The user has enabled developer mode, unintentionally causing these issues.
The battery needs to be replaced due to normal wear and tear.