Question: Hard rock is differentiated from heavy metal by containing more of an influence of what genre?

Is "While hard rock maintained a bluesy rock and roll identity, including some swing in the back beat and riffs that tended to outline chord progressions in their hooks, heavy metal's riffs often functioned as stand-alone melodies and had no swing in them." the correct answer?
pick from the following.
(I). yes
(II). no
(I).