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Let be such that is a tautology. Then
Options:
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Verified Answer
The correct answer is:
Given,
be such that is a tautology
Now checking all options by making truth table we get,
Option
| T | T | T | T | T |
| T | F | F | T | F |
| F | T | T | T | T |
| F | F | T | F | F |
Option
| T | T | T | T | T |
| T | F | F | F | F |
| F | T | T | F | T |
| F | F | T | F | T |
Option
| T | T | T | T | T |
| T | F | F | T | T |
| F | T | T | T | T |
| F | F | T | F | T |
Hence, it is a tautology.
Option
| T | T | T | T | T |
| T | F | F | F | F |
| F | T | T | F | F |
| F | F | T | F | F |
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