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【考题训练第二十三期】 "Warranty of a service" means?

"Warranty of a service" means?
a) The service is fit for purpose b) There will be no failures in applications and infrastructure associated with the service c) All service-related problems are fixed free of charge for a certain period of time d) Customers are assured of certain levels of availability, capacity, continuity and security 答案是哪一个,大家一起来分析下~