A doubt - End-to-End Project - Optionals

In this topic - End -to-End Project, I have attempted & completed all the Questions from 1 - 31 which are pertaining to the Project.

That was attempted more than 1 month ago. Now I believe some of the topics have been re-revised wherein some Projects are marked as Optional.

This is with respect to 32-34 Questions (under End-to-End Project) that are marked as Optional.

I didn’t follow this point. Is it that I need to attempt atleast 1 Additional project under the aforesaid topic i.e. from Questions 32 - 34. Can someone clarify regarding the same???

Already attempted upto Ques. 31. How do I proceed ahead to complete this topic wherein 3 Projects from 32-34 are given as Optionals???