
Explanation:
Box 1: ExpressRoute Global Reach
For optimal routing performance when connecting an on-premises network to two peered Azure virtual networks via ExpressRoute, ExpressRoute Global Reach is the best suited option. This feature allows for seamless connectivity between on-premises networks connected to different ExpressRoute circuits, enabling efficient traffic flow between your on-premises network and both peered Azure VNets.
Box 2: Connect Vnet2 directly to Circuit1.
With ExpressRoute Global Reach, two connections are needed when linking an on-premises network to two peered Azure virtual networks. Each connection is established between the on- premises network and a specific ExpressRoute circuit, which in turn is linked to a peered Azure virtual network.
Reference:
https://learn.microsoft.com/en-us/azure/expressroute/expressroute-global-reach