Digital Signal level 1 (DS-1) is the framing specification used for transmitting digital signals at 1.544 Mbps on a T1 facility. DS-0 is the framing specification used in transmitting digital signals over a single 64 Kbps channel over a T1 facility. DS-3 is the framing specification used for transmitting digital signals at 44.736 Mbps on a T3 facility.
DS-2 is not a defined framing specification.
Source: KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the
Ten Domains of Computer Security, John Wiley & Sons, 2001, Chapter 3:
Telecommunications and Network Security (page 114).

Incorrect answer:
*"A weakness in a system that could be exploited" describes a vulnerability
*"A company resource that could be lost due to an incident" describes an asset
*"The minimization of loss associated with an incident" describes risk management.