What does a Cisco router use automatically to create link-local addresses on serial interfaces when OSPFv3 is implemented?

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#1

What does a Cisco router use automatically to create link-local addresses on serial interfaces when OSPFv3 is implemented?

  1. the highest MAC address available on the router, the FE80::/10 prefix, and the EUI-48 process
  2. the FE80::/10 prefix and the EUI-48 process
  3. the MAC address of the serial interface, the FE80::/10 prefix, and the EUI-64 process
  4. an Ethernet interface MAC address available on the router, the FE80::/10 prefix, and the EUI-64 process*