Which two control plane policer designs must be considered to achieve high availability? (Choose two.)

Which two control plane policer designs must be considered to achieve high availability? (Choose two.)

A. Control plane policers are really needed only on externally facing devices. B. Control plane policers can cause the network management systems to create false alarms. C. Control plane policers require that adequate protocols overhead are factored in to allow protocol convergence. D. Control plane policers must be processed before a forwarding decision is made. E. Control plane policers are enforced in hardware to protect the software path, but they are hardware platform-dependent in terms of classification ability.