Which of the following statements is true about sha1 and sha2?
1) sha1 and sha2 are currently the most widely used hashing algorithms.
2) sha1 is the most widely used hashing algorithm while sha2 is less commonly used.
3) sha2 is the most widely used hashing algorithm while sha1 is less commonly used.
4) Neither sha1 nor sha2 are widely used hashing algorithms.

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