To establish a default choice for a group of radio buttons, you should use ____.

A security director has contracted an outside testing company to evaluate the security of a newly developed application. None of the parameters or internal workings of the application have been provided to the testing company prior to the start of testing. The testing company will be using:

A. Gray box testing B. Active control testing C. White box testing D. Black box testing

A(n) ____________________ connects two or more cable segments and retransmits any incoming signal to all other segments.

Fill in the blank(s) with the appropriate word(s).