Which statement about facts and opinions in memoirs is true?

Facts and opinions in memoirs are synonymous.
Many of the facts in memoirs would be considered opinions in other types of nonfiction.
There is no such thing as a fact in a memoir: everything is opinion.
Most of the opinions in memoirs would be considered facts anywhere else.

Question

Which statement about facts and opinions in memoirs is true?

Facts and opinions in memoirs are synonymous.  
Many of the facts in memoirs would be considered opinions in other types of nonfiction.  
There is no such thing as a fact in a memoir: everything is opinion.  
Most of the opinions in memoirs would be considered facts anywhere else.

anonymous_user · Answer

I think it would be this one: There is no such thing as a fact in a memoir: everything is opinion.

yousir · Answer

That is incorrect because a memoir is a semi biography or story of someone's life.