Select the option, which is the logical equivalent of the statement given below:
It is not true that both Swarna and Swapna are writers.
1. Swarna is not a writer and Swapna is a not a writer.
2. Swarna is not a writer or Swapna is not a writer.
3. Swarna is not a writer and Swapna is a writer
4. Swarna is a writer and Swapna is not a writer