The following is/are not a unit of time:
| (a) | second |
| (b) | parsec |
| (c) | year |
| (d) | light year |
Choose the correct option:
| 1. | (a, c, d) |
| 2. | (a, c) |
| 3. | (b, d) |
| 4. | (b, c) |
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