Refer to the exhibit.

Your company designed a network to allow server VLANs to span all access switches in a data
center. In the design, Layer 3 VLAN interfaces and HSRP are configured on the aggregation
switches. Which two features will improve STP stability within the network design? (Choose two.)

A.
BPDU guard on access ports

B.
Edge port on access ports

C.
Root guard on access ports

D.
BPDU guard on the aggregation switch downlinks toward access switches

E.
Root guard on the aggregation switch downlinks toward access switches

F.
Access switch pairs are explicitly determined to be root and backup root bridges