Which of the following are the four types of lock-down systems?

The four common types of physical lock-down systems for protecting hardware, especially in IT environments, include:

Cages: Enclosures for servers or critical equipment.

Plates: Lock-down plates secured to desks or floors.

Cables: Security cables to tether devices.

Alarms: Motion or tamper-detection systems.

These measures are used to deter theft and unauthorized physical access.