Why must authorities issue the miranda warning to arrested persons? a. to ensure that those accused of crimes are granted a speedy and public trial before a jury of their peers b. to remind all present that the arrest is not being made based upon a bill of attainder or an ex post facto law c. to inform those in custody of their constitutional right to remain silent, to avoid self-incrimination, and to receive legal counsel d. to convey to the prisoner the reason for his or her arrest and to allow a judge to certify the legality of the persons imprisionment