In the customer’s environment， a group of five employees work within a room that has three PCs. The PCs have excellent hardware configurations， with considerable RAM and a fast CPU. The employees use these PCs only when they need to access an application， which is for a short duration of time. For the rest of the time， they work with their tools on their desks. Which IBM Tivoli Access Manager for Enterprise Single Sign-On session management configuration should be used for these three PCs for optimum performance？（）

A、Citrix workstation

B、personal workstation

C、shared workstation， private desktop

D、shared workstation， shared desktop