Which of the following conditions guarantees that a broadcast storm cannot occur?

Which of the following conditions guarantees that a broadcast storm cannot occur?

A.
a native VLAN mismatch on either side of an 802.1Q link

B.
BPDU filter configured on a link to another switch

C.
Spanning Tree Protocol enabled on both Layer 2 and multilayer switches

D.
PortFast enabled on all access and trunk ports