Which of the Following Is True of a Maximum-Security Prison

Which of the following is true of a maximum-security prison?

A) They are surrounded by concrete walls that stand twenty to thirty feet high and have also been sunk deep into the ground to deter tunnel escapes.
B) Prisoners are strip-searched before and after leaving their cells, and are placed in waist restraints and handcuffs on their way to and from the "yard" and showers.
C) They have a podular design, in which each "pod" contains "living units" for individual prisoners.
D) Prisoners are provided with amenities such as televisions and computers in their rooms.