The three relevant purposes of a public service campaign are:
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To guide or alter behaviors - Public service campaigns often aim to encourage positive behavior changes in the community, such as promoting healthy lifestyles or safe practices.
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To influence public opinion - These campaigns seek to shape the way people think about specific issues, thereby fostering understanding and support for particular viewpoints.
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To raise awareness about an issue - Public service campaigns frequently focus on informing the public about important social, health, or environmental issues, highlighting their significance and encouraging community involvement.
The other options listed are typically not primary purposes of public service campaigns.