Which of the following is spy software that records activity on Macintosh systems via snapshots, keystrokes, and Web site logging?

Spector is designed specifically for Macintosh systems and operates by taking periodic snapshots of the screen, logging keystrokes, and tracking visited web sites, which matches the description in the question exactly. It runs silently in the background, making it a classic example of Mac-targeted spy software.

Magic Lantern is an FBI-developed keystroke logging tool that targets Windows systems, not Macintosh, and does not perform snapshot or web site logging in the same manner.

eBlaster is employee monitoring software that forwards activity logs via email but is not specifically known as Mac-targeting spyware with snapshot and keystroke capabilities matching this description.

NetBus is a remote access trojan (RAT) for Windows systems that allows remote control, not a Mac-specific spyware tool that records snapshots, keystrokes, and web activity.