II, Which one is correct ?

Question

1, A friend of Peter told me that... / A friend of the manager told me...

2, A friend of Peter's told me that... / A friend of the manager's told me...

Answer 1

1

When you say "Peter's" that's initially taking care of the fact that something belongs to him

Saying "A friend of" + "Peter's" is redundant

Answer 2

1

Answer 3

{1} is correct buddy

Answer 4

1 is correct of the two, but I would say "Peter's friend told me that..."

The book is wrong.  In this case it's redundant. "Friend of" and "Peter's" have the same meaning.  That's like saying "My mine friend.."  What's the name of your book?