Which type of signaling does Serial ATA (SATA) use?

A.
High-Voltage Differential (HVD)

B.
Low-Voltage Differential (LVD)

C.
Differential (DIFF)

D.
Single-Ended (SE)

Explanation:
Serial ATA uses Low-Voltage Differential (LVD) signaling as does Ultra2 SCSI, Wide Ultra2 SCSI, Ultra160 SCSI, Ultra320 SCSI and Ultra640 SCSI.
Incorrect
Answers:
A, C, D: High-Voltage Differential (HVD) signaling, which is also called Differential (DIFF) signaling, and Single-Ended (SE) signaling is used with SCSI, not SATA.
References:

Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 143-147, 173-178.
Brad Hryhoruk, Diana Bartley, and Quentin Docter, Server+ Study Guide (2nd Edition), Sybex, Alameda, CA, 2002, pp. 119-120.