Hmm, I'm not sure about the QoS part. I thought IES and VPWS/VPLS both support QoS. But the IP-MTU and virtual route table aspects are clear differentiators.
Definitely B and D. IES is a Layer 3 service, so it needs an IP address and supports MTU configuration. The virtual route table is also a must-have for IES.
I think the key differences are that IES has a configurable IP-MTU and requires a virtual route table, while VPWS/VPLS don't have those requirements. The IP address on the IES interface is also a giveaway.
Sabine
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