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Consider a parity check code with three data bits and four parity check bits.
Three of the Code Words are $0101011, 1001101$ and $1110001.$
Which of the following are also code words?

1. $0010111$
2. $0110110$
3. $1011010$
4. $0111010$
1. I and III
2. I, II and III
3. II and IV
4. I, II, III and IV