You are troubleshooting a mobile device that will not pair with a Bluetooth headset. The device was functioning properly with the headset until a recent corporate-wide OS update. No other mobile devices in the organization are exhibiting this issue with Bluetooth headsets.Which of the following is the first step you will take to resolve this issue?
a. Reset the network settings in the mobile device Settings app.
b. Replace the Bluetooth headset with a new pair.
c. Update the radio firmware in the mobile device.
d. Forget all Wi-Fi networks on the mobile device.

Since all other mobile devices, after receiving the "corporate-wide" OS update, aren't having issues with pairing with Bluetooth headsets, we can safely conclude that the OS update isn't the issue.

To find out if the Bluetooth headset is not the culprit, we can try to pair the mobile device with a different headset. If it pairs correctly, then we can conclude that the old Bluetooth headset might have a fault, or it might need to be disconnected/forget from the device and paired gain.