A hospital that is technologically well equipped and everything is being managed well in a smooth way. The massive routine administrational activities, routine patient admissions and investigations are carried out on a frequent basis. Mainly this hospital treats psychologically ill and paralysed patients. Always there remains a very high ratio of these patients for their follow-up visits as compared to new admissions. Due to heavy and large-scale provision of services, there remains a problem to manage the patient’s appointment for revisit whose treatment duration is long. Because of this high threshold of revisits/follow-up patients, the system needs to be optimized to perform efficiently. For this purpose, they need a system upgrade which could make a fast search of the recent patients for giving them the follow-up/revisit time. The system must have smooth performance, efficient memory usage and manipulations (insertion, deletion, search) of data.From doubly linked list and singly linked list data structures which data structure(s) you will choose for the upgradation of the system? Select data structure(s) answer in 7-8 please