When initiating outbound traffic to the internet from VM1, which public address is used?

You have the Azure environment shown in the exhibit.

VM1 is a virtual machine that has an instance-level public IP address (ILPIP).
Basic Load Balancer uses a public IP address. VM1 and VM2 are in the backend pool.
NAT Gateway uses a public IP address named IP3 that is associated to SubnetA.
VNet1 has a virtual network gateway that has a public IP address named IP4.
When initiating outbound traffic to the internet from VM1, which public address is used?
A. IP1
B. IP2
C. IP3
D. IP4