DCI: simple extend layer 2 data center less than 4000 VLAN? (Choose Two)

DCI: simple extend layer 2 data center less than 4000 VLAN? (Choose Two)
A . OTV
B . VXLAN
C . LISP
D . MPLS
E . L2TP

Answer: A, D

Explanation:

MPLS using AToM or VPLS I guess..

VXLAN could do it but I think they would have not specified "<4000 vlans" if they wanted us to answer that.

In fact, we could even think of L2TPv3…

Even if it’s really dirty, it’s possible

(https://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/l2tpv30s.html#wp1027175

"For L2TPv3, an Ethernet subinterface configured to support VLAN switching may be bound to an Xconnect service so that all Ethernet traffic, tagged with a VID specified on the subinterface, is tunneled to another PE.")