Final answer:
All safety equipment including safety goggles, gloves, and a tire pressure gauge must be used when inflating, mounting, or dismounting tires on split rims or rims with locking rings to ensure safety and proper maintenance.
Step-by-step explanation:
When inflating, mounting, or dismounting tires installed on split rims, or rims equipped with locking rings or similar devices, it is essential to prioritize safety due to the high pressure involved in the process. Therefore, the correct answer is 4) All of the above. This includes the usage of safety goggles to protect the eyes from potential projectile fragments or dust particles, gloves to protect the hands from abrasion and pinching, and a tire pressure gauge to monitor the internal pressure of the tire for optimal inflation. These safety measures are crucial to prevent accidents and ensure proper maintenance of the tire's performance and longevity.