Which of the following statements are true about transmission lines or networks?

I. There is more penetration of fiber-optic transmission lines in the backbone networks of the Internet than there is in customer premises networks, or a higher fraction of all communication links is fiber-optic in the Internet backbone networks relative to customer premises networks.

II. T3 lines offer higher speeds than FastEthernet.

III. An advantage of fiber-optic transmission is that it is less susceptible to electromagnetic interference.

IV. Fast Ethernet gives better performance than 802.11g networks.

		I, III, IV
		II, III, and IV
		I, II, and III
		I, II, III, and IV