Which Is True of the Three Types of Release from Prison

Which is true of the three types of release from prison?

A) Discretionary parole is the most common, then expiration, then mandatory/supervised release.
B) Mandatory release is by far the most common, then discretionary parole, then expiration.
C) Expiration is by far the most common, then discretionary parole, then mandatory/supervised release.
D) They each make up roughly one-third of all releases.