NSE 4 Exam

Hii, 

I am thinking to Write NSE 4 in the upcoming week. So now my doubt is to attend NSE4 exam is it mandatory to complete NSE1, NSE2 and NSE3 Certifications ?? 

Actually i have Completed my NSE1, NSE2 and NSE3 certifications on 12/Aug/2019. And i heard that NSE1, NSE2 and NSE3 certifications is valid till 2 years. In that case my NSE1,NSE2 and NSE3 certifications got expired. So now is it mandatory to recertify all NSE1, NSE2 and NSE3 certifications and then should attend NSE4 or i can attend the NSE4 exam directly.

Kindly please someone update on this .