Can it achieve goals across a range of situations? Roughly Legg and Hutter's 2007 definition. Says nothing about feelings.
Does it pursue a goal through actions that change the world? The safety worry is goal-directed optimization: choosing actions by how well they advance an objective.
Is there something it is like to be it? Block separates phenomenal consciousness (felt experience) from access consciousness (information available for reasoning and report).
The three are drawn side by side on purpose. They aren't rungs on a ladder, and a system can rank high on one and have nothing to show on another. No system gets a consciousness score, because there is no accepted way to measure it.