A Special Interest Group consortium (SIG) formed in 1998 to develop a wireless standard for interconnecting computing and communication devices and accessories, called Bluetooth. With Bluetooth:

A. all manner of consumer electronic devices, from mobile phones and laptops to headsets, printers, and keyboards, can be connected to each other
B. the intercom profile allows for voice communication between a headset and its base station
C. the radio layer establishes a logical link from slave to master (similar to a connection)
D. the Bluetooth protocol architecture has 17 layers

A. All manner of consumer electronic devices, from mobile phones and laptops to headsets, printers, and keyboards can be connected to each other.

Explanation:

Bluetooth was developed in the year 1998 by a Special Interest Group consisting of four mobile organizations namely; Nokia, Toshiba, IBM, and Intel. It is a form of wireless technology that operates a short-range band. With the blue tooth, several electronic devices such as mobile phones, computers, printers, etc., can be interconnected.

Operation is best done in a room where there are higher chances of radio waves on walls and other surfaces.

The blue tooth architecture is basically made up of the piconets and scatter nets. Layers are classified into Application, Datalink, Middleware, and Physical layers.

answer; i believe its compare (b3: b4) ;

yes, but you must first make sure that you'll be able to make your turn or you can crash into other vehicles.