A technician is connecting a hands-free car system via Bluetooth.

When connecting a Bluetooth device like a hands-free car system, using a PIN code adds a layer of security. The PIN code must be entered or confirmed during the pairing process to ensure that the connection is authorized and secure.

D. PIN code: Provides an additional security measure during Bluetooth pairing to prevent unauthorized access.

Why the other options are incorrect:

A. BitLocker: BitLocker is a drive encryption feature used to secure data on hard drives, not for securing Bluetooth connections.

B. Biometrics: Biometrics refers to authentication using physical traits like fingerprints, which are not typically used for Bluetooth connections.

C. TPM: Trusted Platform Module (TPM) is a hardware security feature used for encryption and secure boot processes, not for Bluetooth pairing.

This falls under the Mobile Devices and Security domain in the CompTIA A+ Core 1 exam​.