"It was my choice," Daneel confirms. "In order to uphold the Zeroth Law, it would have been necessary. And the Zeroth Law was certainly something I worked on, though friend Giskard's input was invaluable, and I would give him partial credit."

He shakes his head. That isn't relevant, so far as he can see.

"I've always been free to make judgement as to what actions are best taken," he says. "If a particular action seems likely to reduce harm, then of course I should take it."