Eastern State Penitentiary Is an Example of a Solitary System

Eastern State Penitentiary is an example of a solitary system. The aspects that made it a solitary system included:

A) Inmates had no human contact and were in utter silence
B) Inmates stayed in their cells for the duration of their sentences
C) Inmates could read the Bible and reflect on their past deeds, working toward rehabilitation
D) All of the above