Explanation:
Box 1: Standard V2 tier
The Azure Application Gateway Standard_v2 and WAF_v2 tiers support autoscaling and can scale up to 125 capacity units. Each capacity unit can handle a certain number of persistent connections, and additional capacity units are added as limits are reached.
The Azure Application Gateway Standard_v2 tier is generally the cheaper option compared to the WAF_v2 tier. While both tiers have a base cost per hour, the WAF_v2 tier includes additional features for web application firewalling, which is reflected in its higher hourly cost.
Box 2: 10
You must specify a minimum and optionally maximum instance count. Minimum capacity ensures that Application Gateway and WAF v2 don't fall below the minimum instance count specified, even without traffic. The minimum instance count can range from 0 to 100. Each instance is roughly equivalent to 10 more reserved Capacity Units.
Reference:
https://learn.microsoft.com/en-us/azure/application-gateway/application-gateway-autoscaling- zone-redundant