Asafe prison is one in which staff and inmates are relatively safe from assaults or other violent acts.

TRUE. A safe prison would require provisions for the physical safety of both inmates and staff. This means both types of individuals would be granted security from assault and violent acts. The staff members will not feel violated by other employees or inmates and the inmates would serve their sentence as recommended by the courts without being harmed.

It's most likely choice a, it makes the most sense in my opinion.