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The diagram shows a campus with a L2 switched backbone. The backbone has a single VLAN (= subnet) with no loops. The links into the backbone are routed interfaces, not VLAN trunks. Switch X is the STP root of the core VLAN and switch Y is the standby root. The connection between X and Y is an EtherChannel. The network architect wants to add more redundancy by connecting the L3 switches in the distribution layer to both X and Y. What best describes that plan?
A.
It is a sound idea because it increases bandwidth and redundancy.
B.
It is not sound financially because the extra links will be blocking.
C.
It will cause loops that STP cannot resolve.
D.
It is impossible because routers cannot have two interfaces on the same subnet.
E.
It is a sound idea because packets take a single L2 hop across the backbone.