You have an Azure subscription that uses the public IP addresses shown in the following table.
You need to create a public Azure Standard Load Balancer.
Which public IP addresses can you use?
C
Explanation:
Matching SKUs are required for load balancer and public IP resources. You can't have a mixture of Basic SKU resources
and standard SKU resources.
Reference: https://docs.microsoft.com/en-us/azure/virtual-network/ip-services/public-ip-addresses
answer is correct
you cant mix SKU's