Which of the following code snippets can be used to create custom POST status in wordpress 3.0 +?

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Which of the following code snippets can be used to create custom POST status in wordpress 3.0 +?
Answers:
1.      register_new_post()
2.      register_post_status()
3.      add_new_post_status()

4.      modify_post_status()
GA
Gaurav Arora, Digital Media Lead. 10+ years running paid media and tracking for brands in the USA, UK and Canada.