Answer:
The correct answer is c. EUI-64.
Step-by-step explanation:
The OS generated IPv6 MAC address must conform to EUI-64 (Extended Unique Identifier 64-bit) format, which is a modified version of the EUI-48 (Extended Unique Identifier 48-bit) format. EUI-64 is a standardized way of creating a unique identifier for network devices, and it's commonly used to create the Interface Identifier (IID) part of an IPv6 address. The IID is created by combining the 48-bit MAC address with 16-bits of additional data to form a 64-bit value. This ensures that the IID is globally unique, and it helps prevent address collisions on the network.