Which of the following is NOT an example of cruel and unusual punishment by today's standards?

a) forcing multiple inmates to share a small prison cell by giving them bunk beds to sleep in

b) execution of a criminal who has been assessed as being mentally retarded

c) forcing a defendant to take medication that was never prescribed by a doctor for any documented illness so that the defendant will be more lucid during trial

d) executing a prisoner by lethal injection after a jury of his peers determined he was guilty of capital murder in one trial that included the trial and sentencing phases at the same time

e) feeding only bread and water to prison inmates