Final answer:
The abbreviation for the RULES REGULATIONS of Nevada isn't provided in the options. NAC and NRS are common abbreviations for Nevada's state regulations and statutes, respectively.
Step-by-step explanation:
The abbreviation that refers to the RULES REGULATIONS of Nevada is not explicitly listed among the options you've given (1) RRN 2) REF 3) RLR 4) RR). In general, abbreviations for state rules and regulations can vary, and without additional context, it's difficult to determine the correct one solely based on these options. For official documents or references, a more commonly used abbreviation would be 'NAC' for Nevada Administrative Code, which is a compilation of all permanent regulations adopted by Nevada state agencies, or 'NRS' for Nevada Revised Statutes, which are the current codified laws of the State of Nevada. Please refer to the specific context or document for the correct abbreviation.
In the absence of a standardized abbreviation, one could use "RRN" (Rules and Regulations of Nevada) for convenience, but it's essential to ensure that this aligns with any official or widely recognized designation used by the relevant authorities.
To accurately determine the accepted abbreviation for Nevada's rules and regulations, consulting the most recent and authoritative sources directly associated with the state's regulatory bodies would be the most reliable approach.