Question: ? _ _ _ i s a s e r v i c e t h a t u s e s t h e
A. I n t e r n e t t e l e p h o n y
B. I n t e r n e t b r o a d c a s t
C. T e l e p h o n e r e l a y
D. C a l l f o r w a r d i n g
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