It shall be unlawful and constitute a gross misdemeanor for any person to act or serve in the capacity of a nursing home administrator unless he or she is the holder of a nursing home administrator's license issued in accordance with the provisions of this chapter: PROVIDED HOWEVER, That persons carrying out functions and duties delegated by a licensed administrator as defined in RCW 18.52.030 shall not be construed to be committing any unlawful act under this chapter.