you need to press within 60 seconds after the headset, mute, and speaker buttons begin to flash duri

What do you need to press within 60 seconds after the headset, mute, and speaker buttons begin
to flash during the factory reset process for a 7975G IP Phone?

A.
123456789*0#

B.
23456&****

C.
12345678010##

D.
1247829000**&