A user reports that their smartphone frequently becomes extremely hot to the touch, especially during or after charging, and battery life has significantly decreased. Upon inspection, you notice the battery is slightly bulging. Based on the principles of troubleshooting mobile devices, what is the BEST course of action to take to resolve this issue?
Replace the battery.
Uninstall the last few apps that were added before the problem started occurring.
Let the device cool down and continue monitoring the battery temperature during use.
Reset the device to its factory settings.
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