When is it recommended to block VRRP hellos between routers in the same VRRP instance?
A. when the VRRP master and VRRP backup router are part of the same IRF virtual device
B. when providing two VRRP master routers to be deployed in different data centers
C. when the VRRP master and VRRP backup router are part of a TRILL domain
D. when the VRRP master and VRRP backup router are top of the rack (ToR) switches
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