Explanation:
Box 1: No
The name of the virtual network is set to VNET1.
The location of the virtual network will be the same as the location of the resource group.
Box 2: Yes
Configure subnets by using the subnets property
Virtual networks contain subnets, which are logical groups of IP addresses within the virtual network. There are two ways to define subnets in Bicep: by using the subnets property on the virtual network resource, and by creating a child resource with type Microsoft.Network/virtualNetworks/subnets.
Box 3: No
Note: Although both approaches enable you to define and create your subnets, there is an important difference. When you define subnets by using child resources, the first time your Bicep file is deployed, the virtual network is deployed. Then, after the virtual network deployment is complete, each subnet is deployed. This sequencing occurs because Azure Resource Manager deploys each individual resource separately.
Reference:
https://learn.microsoft.com/en-us/azure/azure-resource-manager/bicep/scenarios-virtual-networks