Which of the following is a standard IEEE 1394 transmission speed?

The standard IEEE 1394, commonly known as FireWire, supports multiple data transfer speeds. One of its most recognized specifications is the speed of 400 Mbps, which is used in FireWire 400 (IEEE 1394a). This transmission speed allows for relatively fast transfer rates for devices like external hard drives, audio interfaces, and video cameras that support FireWire.

While there are other speeds associated with various standards of IEEE 1394, such as 100 Mbps for the older FireWire 100 and 800 Mbps for FireWire 800 (IEEE 1394b), the 400 Mbps specification is broadly acknowledged and is often the standard that many users refer to in real-world applications. The 480 Mbps speed is associated with USB 2.0, and 1000 Mbps falls under the category of Gigabit Ethernet or other high-speed connections, which do not relate to the IEEE 1394 specifications.