100BASE-FX is an Ethernet standard for Fast Ethernet over fiber optic cabling and it supports a data rate of 100 Mbps, which is consistent with the original Fast Ethernet specifications. 1000BASE-SX is a Gigabit Ethernet standard supporting 1 Gbps, which is ten times faster and not the correct answer for this question. 10GBASE-T is a standard for 10 Gigabit Ethernet over twisted-pair cables and does not match the description given. 1000BASE-T is designed for Gigabit Ethernet transmission over Cat 5e or higher grade twisted-pair cables, thus also not fitting the description pertaining to fiber optics at 100 Mbps.