Which of the following technologies was created to reduce cost, increase cable length, and uses 3.3v across the line?

Wide-Ultra2 SCSI-3 is a SCSI standard that utilizes LVD technology but is not the technology itself that provides the specified benefits of reduced cost, increased cable length, and 3.3v operation.

High-Voltage Differential (HVD) uses significantly higher voltages, which typically results in shorter cable lengths, higher power consumption, and potentially higher costs compared to LVD.

Low-Voltage Differential (LVD) is a signaling technology, notably used in SCSI-3 standards like Ultra2 SCSI, which operates at 3.3 volts. This low voltage operation reduces power consumption and electromagnetic interference, allowing for significantly longer cable lengths (up to 12 meters) and generally lower implementation costs compared to earlier high-voltage differential signaling.

Fibre Channel is a different high-speed networking technology primarily for storage area networks (SANs) and while it supports long distances, it does not rely on "3.3v across the line" in the same electrical signaling context as LVD SCSI and is generally more complex and expensive for direct device attachment.