Usage of "any"

Hi there, are the following sentences correct? As an English speaker which one would you prefer? I admit I have asked many questions regarding any. Still I have some doubts.

  1. If any student is interested in joining the programme, he or she is requested to contact the authority.
  2. If any students are interested in joining the programme, they are requested to contact the authority.
  3. Any student interested in joining the programme is requested to contact the authority.
  4. Any students interested in joining the programme are requested to contact the authority.

 

I have noticed that any can be used with both singular and plural nouns. But when any is used with if and in questions like the avove, should I use a plural noun or a singular noun?  

Please confirm as an English speaker or as an English teacher which one you would prefer.

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