Which position of the Mac address?

An EUI-64 bit address is formed by adding a reserved 16-bit value in which position of the Mac address?
A. between the vendor OID and the NIC-specific part of the MAC address.
B. after the NIC-specific part of the MAC address.
C. before the vendor OID part of the MAC address.
D. anywhere in the Mac address, because the value that is added is reserved.