Answer:
Voice over Internet Protocol (VoIP), also called IP telephony, is a method and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet. The terms Internet telephony, broadband telephony, and broadband phone service specifically refer to the provisioning of communications services (voice, fax, SMS, voice-messaging) over the Internet, rather than via the public switched telephone network (PSTN), also known as plain old telephone service (POTS).
(x, y)
Domain = x
Range = y
It is a function when none of the x values are repeating.
Answer - C) Both A and B
Hope this helps and makes sense!!
It has C. Rotational.... 180 degree rotational symmetry
No i dont think so but i could be wrong i will double check to be sure though