A user visits the help desk to report that a smartphone takes more than a day to fully charge. The user already tested multiple wall outlets and swapped the charging cable, but the results are the same. Which of the following should the technician do FIRST?


A. Verify the power rating of the charger.
B. Ensure all unnecessary connectivity features are disabled.
C. Check that all missing smartphone OS updates are applied.
D. Complete a factory reset of the phone.