Question about SMCA

Hello, I have a concern about the determination of activities, products and services. I would like to take a practical case of an organization whose sole activity is to operate and maintain the IT system of a bank. the Bank retains 3 critical processes that must never be interrupted: customer management, credit management, collection

We want to do the SMCA (Système de Management de la Continuité d'Activité) for the Bank's computer system. What to remember in the products and services of the SSSI (Société de Services en Systèmes d'Informations)?
i) Product: Computer System, Services: Management and maintenance of the Computer System, customer management, credit management, collection
ii) Product: IT system, Services: customer management, credit management, collection
iii) Product: Computer System, Services: Management and maintenance of the Computer System