Which of the following steps need to be taken?

In order to pair a phone with another device like a GPS or a car stereo through Bluetooth, which of the following steps need to be taken?
A. Put both devices in discovery mode and type in the generated pin into both devices
B. Put both devices in discovery mode and type in the generated pin
C. Put the second device in discovery mode and type in the generated pin
D. Put the phone discovery mode and type in the generated pin

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