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Which of the following is NOT a proprietary instant messaging (IM) service?

bechme

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Which of the following is NOT a proprietary instant messaging (IM) service?

Which of the following is NOT a proprietary instant messaging (IM) service?

A) Google Hangouts B) LinkedIn Messenger
C) Yahoo Messenger D) Skype

The global positioning system is a network of 21 ________ plus 3 working spares.

A) communicators B) satellites C) transponders D) base stations

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andrea63857

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Skrupe

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thank you

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