Which one of the following statements is TRUE?

1
A, B, and Z DNA helices are left-handed.
2
A and B DNA helices are right-handed, Z DNA helix is left-handed.
3
A, and Z DNA helices are left-handed, B DNA helix is right-handed.
4
A, and B DNA helices are left-handed, Z DNA helix is right-handed. 

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