Which of the following do you need to take into account when designing multitopology IS-IS? (Select two.)

Which of the following do you need to take into account when designing multitopology IS-IS? (Select two.)
A . Multitopology IS-IS should be avoided when IPv4 coexists with IPv6 in the same network.
B . When multitopology for IPv6 is used, IS-IS wide metric should be considered.
C . In migration scenarios (moving from single to multitopology), you should consider the multitopology transition mode.
D . All routers must be configured as L1.
E . All routers must be configured as L2.
F . Single SPF process will be carried for all the configured topologies.

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Answer: BC