Katherine Anne Porter's short story "The Grave" is written in third person omniscient. Just in case, here is a summary of point of views (or narrations).
First person uses the pronouns "I," "me," "us", and "we." The narrator of the story is telling his or her own story.
Second person uses the pronouns "you," "your," and "yours." Not many texts are written from this perspective given it can alienate a reader (based upon gender, thinking, or stereotypes).
Third Person omniscient uses pronouns such as "he/she" and "they/them." The narrator is not part of the story, yet the narrator knows everything about everyone in the story. Given that none of the characters in the story are telling their own story, "The Grave" is written in third person.