What is correct to demonstrate possessive: Chris' or Chris's?
The correct answer is : Chris'
If the noun ends in "s" to form a possesive you add an apostrophe only.
They are both correct.
There are people who will argue either way, but there is no actual rule.
"This is Chris' book."
"This is Chris's book."
Both are correct.
All of the following are correct and mutually intelligible: