Which two of these practices are considered to be best practices when designing the access layer for the enterprise camp

[answerhappygod]

Which two of these practices are considered to be best practices when designing the access layer for the enterprise campus? (Choose two.)

A. Implement all of the services (QoS, security, STP, and so on) in the access layer, offloading the work from the distribution and core layers.
B. Always use a Spanning Tree Protocol; preferred is Rapid PVST+.
C. Use automatic VLAN pruning to prune unused VLANs from trunked interfaces to avoid broadcast propagation.
D. Avoid wasted processing by disabling STP where loops are not possible.
E. Use VTP transparent mode to decrease the potential for operational error.