When configuring IPv4 and IPv6 IS-IS routing on Cisco IOS XR routers, which three statements are correct? (Choose three.)

When configuring IPv4 and IPv6 IS-IS routing on Cisco IOS XR routers, which three statements are correct? (Choose three.)
A . By default, a single SPF is used for both IPv4 and IPv6, so the IPv4 and IPv6 topology should be the same.
B . By default, the IS-IS router type is Level 1 and Level 2.
C . All IS-IS routers within the same IS-IS area must be configured with the same IS-IS routing process instance I
E . By default, metric-style narrow is used.
F . By default, the IS-IS interface circuit type is Level 1 and Level 2.
G . The area IS-IS address-family configuration command is used to specify the IS-IS area address.

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Answer: B,D,E