Which command must the engineer configure on the CPE?

Refer to the exhibit.

The administrator must configure a floating sialic default route that points to 2001:db8:1234:2::1 and replaces the current default route only if it fails. Which command must the engineer configure on the CPE?
A. ipv6 route ::/0 2001:db8:1234:2::1 3
B. ipv6 route ::/128 2001 :db8:1234:2::1 3
C. ipv6 route ::/0 2001:db8:1234:2::1 1
D. ipv6 route ::/0 2001:db8:1234:2::1 2

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