C. You can assign a given instance multiple public IPs across one or more VNICs.
C is wrong!
Because to add another public IP address we have to add another VNIC.
And the statement says one or more!
https://docs.oracle.com/en-us/iaas/Content/Network/Tasks/managingpublicIPs.htm
The assignment is actually to a private IP object on the instance. The VNIC that the private IP is assigned to must be in a public subnet. A given instance can have multiple secondary VNICs, and a given VNIC can have multiple secondary private IPs. So you can assign a given instance multiple public IPs across one or more VNICs if you like.
https://docs.oracle.com/en-us/iaas/Content/Network/Tasks/managingpublicIPs.htm
I think A is wrong.
Attach the public IP address to the primary private IP address object.
I think the point is that there is a concept of a primary "private" IP address, not a primary "public" IP address.
https://docs.oracle.com/en-us/iaas/Content/Network/Tasks/managingIPaddresses.htm
I think C and D are explained in the sentences below.
"A given instance can have multiple secondary VNICs, and a given VNIC can have multiple secondary private IPs. So you can assign a given instance multiple public IPs across one or more VNICs if you like."
"Ephemeral: Think of it as temporary and existing for the lifetime of the instance.
Reserved: Think of it as persistent and existing beyond the lifetime of the instance it's assigned to. "
https://docs.public.oneportal.content.oci.oraclecloud.com/en-us/iaas/Content/Network/Tasks/managingpublicIPs.htm#Public_IP_Addresses
The default (for a public subnet) is for the instance to get a public IP address.
https://docs.oracle.com/en-us/iaas/Content/Network/Tasks/scenarioa.htm
A given instance can have multiple secondary VNICs, and a given VNIC can have multiple secondary private IPs. So you can assign a given instance multiple public IPs across one or more VNICs if you like.
There are two types of public IPs:
Ephemeral: Think of it as temporary and existing for the lifetime of the instance.
Reserved: Think of it as persistent and existing beyond the lifetime of the instance it's assigned to. You can unassign it and then reassign it to another instance whenever you like. Exception: reserved public IPs on public load balancers. See Overview of Public IP Addresses.
https://docs.oracle.com/en-us/iaas/Content/Network/Tasks/managingpublicIPs.htm
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