In a control structure, the computer executes particular statements depending on some condition(s). a. looping b. selection c. sequence d. repetition

The answer is letter c. Selection. In reference to Control Structures. The selection structure does the work to check a condition, then implements one classification of statements as an alternative of an additional, depending on whether the circumstance is factual or untrue. A condition is any variable or expression that proceeds back as a Boolean value

i believe the two important functions that skype uses are nat traversal and user location.good luck        

explanation:

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