Given the SET of relationships modeled below, which event occurs first?

ABC th XYZ RST XYZ ABC RST XYZ ABC and RST occur simultaneously. 0 0 0 0 ABC and XYZ occur simultaneously. RST and XYZ occur simultaneously. ABC th XYZ RST XYZ ABC RST XYZ ABC and RST occur simultaneously. 0 0 0 0 ABC and XYZ occur simultaneously. RST and XYZ occur simultaneously