What does FRIAS stand for?

Fellow of the Royal Incorporation of Architects in/of Scotland (SAUO)

Fellow of the Royal Incorporation of Architects in Scotland (SAUS)

Fellow of the Royal Incorporation of Architects of Scotland (DI)

Fellow of the Royal Incorporation or Architects of Scotland (SAUS)

Fellow of the Royal Institute of Architects in Scotland (SAUO)

Fellow of the Royal Institute of Architects of Scotland