During a recent winter immunization campaign, the Centers for Disease Control and Prevention used the media to encourage all Americans to be vaccinated against the seasonal flu virus. This is an example of a , in which the media donated free space and airtime.

public service announcement                                                                                          

Explanation:

The term public service announcement is described as a particular message in the "public interest" that is being disseminated in the absence of any charge, encompassing the objective or motive of spreading awareness of, and changing or altering public behaviors and attitudes towards a specific social issue or cause.

As per the question, the correct answer is the public service announcement.

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