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what is the suitable shape of links from these options for SEO? 

  /123/why-do-birds-sing 
  /index.php/123/why-do-birds-sing
  /?qa=123/why-do-birds-sing
  /?qa=123&qa_1=why-do-birds-sing
  /index.php?qa=123&qa_1=why-do-birds-sing

1 Answer

+1 vote
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1st link is best : /123/why-do-birds-sing  

i am using in my site : https://www.khansat.com/
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But why it is the best?
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