Read the following sentence and find out the object nouns in them.
No one can betray her.

The correct answer is: Her

A subject noun is a noun that is the subject of the sentence. A subject is a noun that performs the action in that sentence. In contrast, an object noun is a noun that in a sentence i.e., the object noun is the receiver of the action. 'No one can betray her', here the object noun is 'her'.