Final answer:
Prisons are classified into minimum, medium, and maximum security levels, reflecting the restrictions based on inmates' risk and offense severity. Parole and probation refer to forms of supervised release, not prison classifications.
Step-by-step explanation:
Prisons are organized into different classifications based on security levels and the nature of the custody. The classifications relevant to the question are minimum, medium, and maximum security levels.
These levels reflect the varying degrees of restrictions placed on inmates, corresponding to the severity of their offenses and their deemed risk to society and prison order. Parole and probation are not classifications of prisons, but rather forms of supervised release.
Parole is a supervised release after being in prison, and probation is often an alternative to incarceration.