I think the answer to this is A.
Answer:
I. Unidirectional microphone.
II. Bidirectional microphone.
III. Omnidirectional microphone.
Explanation:
Sound are mechanical waves that are highly dependent on matter for their propagation and transmission.
Sound travels faster through solids than it does through either liquids or gases.
A microphone can be defined as an electrical device used for the conversion of sound energy into an electrical signal or energy.
The various forms of microphone include the following;
I. Unidirectional microphone: picks up sound from a specific direction.
II. Bidirectional microphone: picks up sound from two specific directions
III. Omnidirectional microphone: picks up sound from virtually any direction
