Final answer:
Option b. 1000BASE-T is a type of Ethernet that supports up to 1 Gbps data transfer over copper cables. The term Ethernet refers to a family of networking technologies used for local area networks (LANs).
Step-by-step explanation:
The type of Ethernet listed among the options is 1000BASE-T. This is an Ethernet standard that is part of the IEEE 802.3ab standard and supports data transfer rates of up to 1 gigabit per second (Gbps) over Cat 5e or Cat 6 copper cables. The other options a. 4G, c. 802., and d. 11ac are not types of Ethernet. 4G is a standard for mobile telecommunications, '802.' is a reference to the Institute of Electrical and Electronics Engineers (IEEE) 802 LAN/MAN standard committee but on its own is incomplete without the specific standard number, and '11ac' (typically IEEE 802.11ac) relates to wireless networking (Wi-Fi) standards, not Ethernet.