A certain city plans to build a new government cloud and migrate the relatively independent management IT systems of local departments to the cloud. Currently, there are the following requirements…

A certain city plans to build a new government cloud and migrate the relatively independent management IT systems of local departments to the cloud. Currently, there are the following requirements for the construction of the government cloud: the current construction funding is limited, and information security issues need to be considered after the cloud migration. It is hoped that the business cloud migration can be completed as soon as possible; after the cloud migration, the cloud platform can be managed by the government + operator in a maintenance-free manner. Given the above business requirements, which of the following construction methods is most recommended?