A. On-premises environment, because it offers more options for deployment, greater control over operations, but is also more costly to support.

B. On-premises environment, because it offers more options for client deployments and features, same control over the operations as in Cloud environment but is more costly to support.

C. Cloud environment, because it offers easier deployment of servers, offers same control over operations as in On-premises environments, but is not as costly to support.

D. Both On-premises and Cloud environment is the right choice. Both offer same control over the operations, when deploying the product only difference is in support cost.