Refer to the exhibit.A customer is running HSRP on the core routers. Over time the company has grown and requires more network capacity. In the current environm...

Refer to the exhibit.A customer is running HSRP on the core routers. Over time the company has grown and requires more network capacity. In the current environment, some of the downstream interfaces are almost fully utilized, but others are not. Which solution improves the situation?

A. Make router R2 active for half of the VLANs. B. Add more interfaces to R1 and R2. C. Configure port channel toward downstream switches. D. Enable RSTP on the downstream switches.