In which of the following sentence 'all' is used as noun?

- He sacrificed his all for the welfare of his children.
(his possessive case এর object হিসেবে noun)

- All men are mortal.
(Noun 'men' কে modify করায় adjective)

- He was left all alone in the vast sea. (একেবারে)
('alone' adverb কে modify করায় এখানে adverb)

- All is well that ends well.
(বাক্যের subject হিসেবে ব্যবহৃত হওয়ায় Pronoun)