The correct option is Routing preference.

Routing preference on a storage account determines whether client traffic is brought onto the Microsoft network or routed over the public internet. Selecting Microsoft routing causes requests to enter the Microsoft backbone at the nearest point of presence and then travel over the Microsoft network to the storage account which meets the requirement to have clients enter at the closest PoP.

Private endpoints provide private connectivity to a storage account through Azure Private Link and a virtual network. This secures access from inside Azure and connected on prem networks but it does not control how public client requests enter the Microsoft network.

Azure Load Balancer is a regional layer four load balancer for virtual machines and services. It does not provide global anycast ingress or a storage account setting that forces traffic to the nearest Microsoft point of presence.

Azure Front Door is a global edge service that can route users to the nearest Microsoft edge and it can front storage. However it is a separate service rather than a storage account setting and the question asks which setting on the storage account to change so Azure Front Door is not the correct answer.

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