An administrator has a Power 570 in default configuration with a 4 port 1 Gbps Integrated Virtual Ethernet (IVE) adapter. A new application requires that the MCS value for the first port group of the IVE adapter be set to 1. If this change is made, what is the maximum number of logical ports, across both port groups, that the IVE adapter can provide?（）

• A、 4 
• B、 16 
• C、 20 
• D、 32