Multi-homing(1, 0, 0) prefer one interface
This is my idea came accross after simulating.
In
multi-homing(1,0,0), (two MRs, one HA, one prefix) it is better to have
two interfaces rather than client has one interface.
Because, when client do "ping" to HA, if client has 2 interfaces, router
can not decide the way that there is interface do "ping".
In contrast to multi-homing(1, 0 ,0), multi-homing(1, 0, 1), which has two MRs, one HA
and two network prefix, don't have this problem.
In this case, router can decide the route correctly.