The two options that improve WAN scalability and reliability are dual-homed branches and dynamic routing. A dual-homed branch has more than one upstream connection, which reduces the chance that a single circuit, provider, or edge device failure disconnects the site. Dynamic routing improves scalability because routes can be learned, withdrawn, and recalculated automatically as the WAN changes. Static routing can work in small topologies, but it becomes operationally fragile at scale. Single-homed branches are simpler but less resilient. The listed ' asynchronous routing ' choice is not the correct CCNA design answer for business scalability and reliability. Cisco CCNA 200-301 v1.1 IP Connectivity expects engineers to understand that redundancy and automatic route convergence are core design tools. A WAN with dual connectivity and dynamic routing can survive failures and grow with less manual intervention. Therefore, the corrected answer is C and E.
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