Wrong statement among the following is
a. Diamond is the best conductor of heat but insulator.
b. Graphite act as bad conductor of heat but good conductor of electricity.
c. Bucky ball, C60, has 20 six membered & 12 five membered ring.
d. In Fullerene, a six-membered ring is fused with either six or five-membered rings but a fivemembered ring is also fused with five membered ring.