How can Provider B move to AS 601 without forcing Certkiller A to immediately reconfigure?

Refer to the Exhibit. How can Provider B move to AS 601 without forcing Certkiller A to immediately reconfigure?
Exhibit:

642-661-configuring-bgp-on-cisco-routers-bgp_img_198

A. Configure a second BGP AS on the Provider B router. Use the local AS feature with the dual-as keyword.
B. Originate a default route from the Provider A network into Certkiller ‘s network. This will draw routed traffic into the provider network.
C. Configure a confederation between Certkiller A and the provider networks. Use the BGP translate AS feature at the edge of the confederation.
D. Certkiller A must update its BGP neighbor statements or the BGP sessions will no longer match.
E. Add a wide area link between Provider A and Certkiller A configured for eBGP peering. Configure the customer BGP to prevent it from becoming a transit network.

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