The correct statements among the following are:
| a. | Fullerenes have dangling bonds. |
| b. | Fullerenes are cage-like molecules. |
| c. | Graphite is, thermodynamically, the most stable allotrope of carbon. |
| d. | Graphite is slippery and hard and therefore used as a dry lubricant in machines. |
1. a and b
2. b and c
3. c and d
4. a and d
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