Answer:
The four models are press agentry model, public information model, two-way asymmetrical model and two-way symmetrical model. They described how public relations practitioners to be effectively and ethically practiced by offers a normative theory in two-way symmetrical model.
Explanation:
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It provides light to a picture which reaches a sensor by shutter speed. Exposure brings out the light in pictures and is useful when you take a pic that is dark
