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UPPCL AE 2018:76

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Consider the statements:

  1. $\text{A} \Leftrightarrow \text{A} \vee  \sim \text{A}$
  2. $\text{A} \Leftrightarrow \text{A} \vee    \text{A}$
  3. $\text{A} \vee \text{B} \Rightarrow \text{A}$
  4. $\text{A} \Rightarrow \text{A} \vee  \text{B}$

Which of the above refers to tautologies?

  1. $\text{III}$
  2. $\text{I}$ and $\text{II}$
  3. $\text{II}$ and $\text{IV}$
  4. $\text{I}$

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