Which of the following is a method used by USC to enhance student safety on campus?

The emergency messaging system is a critical component of the safety measures at the University of South Carolina. This system provides students, faculty, and staff with real-time alerts about any emergencies or urgent situations on campus, such as severe weather events, security threats, or other critical incidents that may impact safety. By delivering timely notifications via text messages, emails, and other channels, the emergency messaging system ensures that the campus community can quickly receive important information and take appropriate actions to protect themselves.

The other options do not directly contribute to the enhancement of student safety. Standardized tests are primarily educational assessments that measure academic performance, while student attendance monitors focus on tracking attendance in classes. Campus ID validators are aimed at controlling access to certain facilities rather than addressing student safety comprehensively.