To inspect network interface net3, you enter the following commands: 
What problem do you suspect? Assume the user is authorized and provided the correct password.
A.
The net3 interface hasn’t been enabled yet.
B.
The net3 vnic hasn’t been created.
C.
The net3/v4 ip object hasn’t been configured.
D.
The net3 interface is not attached to a NIC or etherstub.
Explanation:
The following command marks the address object net1/v4a up that was previously
marked down.
# ipadm up-addr net1/v4a
a is the correct answer
C
may be net3 use as net3/data or else
So object not found on net3/v4
i go with A option
I think C is the correct as Banchain wrote.
C is correct.
After ipadm create-ip net3 command you will have the net3 in (down/not active) in the ipadm show-if output.
Then you can configure the address onto that interface.
C is the correct , after creating the create-ip you have to create-addr