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3 Different ways to configure VLANs?

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Just trying to double check my sanity and thoughts. I think there are 3 different ways I could setup a VM to get access to a tagged VLAN, and was hoping you might be able to tell me if I am right, and I can just pick and choose, or if I have misunderstood something.

What I'm working with
An ethernet cable plugged into eth1 of the ProxMox machine that has an untagged network, and 2 tagged networks: VLAN 900 and 950.
I'd like my VM guest to have access to all 3 networks.

Option 1
I can make a vmbr1 to eth1.
Add a network device on the VM to vmbr1 set to no VLAN and let the VM do all the untagging with virtual interfaces (The guest happens to be an ubuntu linux machine).

Option 2
I can make a:
  • vmbr1 to eth1
  • vmbr900 to eth1.900
  • vmbr950 to eth1.950

And then add 3 network devices to the VM each plugged into vmbr1, vmbr900, vmbr950 and it would get the network untagged (VLAN tag: no VLAN)

which seems really similar to

Option 3
I can make a vmbr1 to eth1
Then make 3 network devices on the VM each connected to vmbr1
Each one would be configured with VLAN Tag: no VLAN, 900, 950 respectively in the configuration of the network device in ProxMox

Using the latest version of ProxMox.
Thanks much.

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