A lavaliere microphone clips onto the speaker's clothing

Several students sitting together in a student lounge studying for an exam may BEST be defined as a

study group based on which organizational rule? A) rule of similarity B) rule of contrast C) rule of proximity D) rule of context

Besides hard drives, these can be used to store audio files:

A. soft drives B. CD-RWs C. rewritable optical devices D. both A & B E. both B & C F. none of these