Why should portfast be enabled on the Cisco switch ports connected to Virtual Connect?
A. Virtual Connect ports always block network frames if BPDUs are detected.
B. Virtual Connect blocks untagged VLAN traffic by default if it is not enabled.
C. Virtual Connect appears as an edge device to upstream switches.
D. Virtual Connect auto-negotiates 10Gb/1Gb ports incorrectly when connected to Cisco switches.
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