Your company has a single on-premises datacenter in Washington, D.C. The East US Azure region has a peering location in Washington, D.C. All Azure resources are in East US. You must implement ExpressRoute supporting up to 1 Gbps, use only ExpressRoute Unlimited data plans, and minimize cost. Which type of ExpressRoute circuit should you create?

ExpressRoute Local is the correct choice because it offers the lowest cost for scenarios where your on-premises datacenter is in the same metro area as an Azure peering location, and your Azure resources are in the same region. This aligns with the requirement to minimize cost while supporting up to 1 Gbps and using Unlimited data plans. ExpressRoute Direct is incorrect because it provides 10 Gbps or 100 Gbps direct connectivity, which is overkill and significantly more expensive than needed for a 1 Gbps requirement. ExpressRoute Premium is incorrect because it adds global connectivity and a higher number of routes, which are not required here as all resources are in a single region. ExpressRoute Standard is incorrect because while it offers similar bandwidths to Local, it's generally more expensive when a Local option is available in the same metro.