A closed category prison is a type of prison where the highest level of security is required, and the risk of escape is considered high. Closed category prisons are also known as Category A, B, and C prisons. These prisons are secure, and people cannot escape from them. In the UK, male adult prisoners are given a security categorization soon after they enter prison, based on the type of crime committed, the length of sentence, the likelihood of escape, and the danger to the public if they were to escape. The four categories are A (High Security), B (Closed), C (Training and Resettlement), and D (Open) . Women and young adults who are considered high risk are categorized as "restricted status," meaning they can only be held in a closed prison. Female prisoners who present too high a risk for open conditions are also held in closed conditions.