Please choose the correct ending to complete the given sentence: Health: [header] How to select hearing protection [title] Familiarize yourself with noise reduction ratings (nrr). [step] Nrr is the standard rating system across all hearing protection devices. Under nrr, hearing devices are classified by their potential to limit decibels (db) in professional and occupational environments.

Ending1: Nrrs are determined by both the american national standards (ansi) and the occupational safety and health administration (osha). Understanding this rating system will allow you better understand the noise you are exposed to as well as the type of protection you will need. Ending2: Make sure to research nrr before choosing it. Listen to the sounds transmitted by the device and select one. Ending3: Understanding nrr means that it helps to build a strong sound system and to make an at-home system that is stable. [substeps] Many nrr review videos as part of their educational training. Ending4: The nrr provides information on hearing capabilities in charging devices such as glofax and other cell phones that humans use as noise treatments. Nrr is also a smart system for hearing diagnostic monitors.

Answer format: ending1/ending2/ending3/ending4