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C. 64 bits
In a 6LoWPAN (IPv6 over Low-Power Wireless Personal Area Networks) address, the portion that is globally unique is derived from the IEEE 802.15.4 MAC address, which is typically either 48 or 64 bits in length. When forming an IPv6 address from these, a common practice involves using a 64-bit interface identifier, which is often based on the MAC address, following the “modified EUI-64” format. This results in 64 bits that are globally unique within the context of forming IPv6 addresses in a 6LoWPAN network.