AHSME 1999 Problem 10

A sealed envelope contains a card with a single digit on it. Three of the following statements are true, and the other is false. I. The digit is 1. II. The digit is not 2. III. The digit is 3. IV. The digit is not 4. Which one of the following must necessarily be correct? $\textbf{(A)}\ \text{I is true.} \textbf{(B)}\ \text{I is false.} \textbf{(C)}\ \text{II is true.} \textbf{(D)}\ \text{III is true.} \textbf{(E)}\ \text{IV is false.}$