An advertisement from a political action committee intended to attract support from the public by promoting a position, like the ad detailed in the transcript from Mayors Against Illegal Guns, is known as what

The 6th amendment's guarantee of a speedy and public trial is aimed at a. deterring potential criminals by fear of swift and certain punishment. b. trying those accused of crimes without undue delay and avoiding secret trials. c. eliminating overcrowded dockets in the nation's criminal courts. d. preventing jurors from being unduly influenced by public opinion.