How does a third-person omniscient narrator differ from a third-person limited narrator?

a. a third-person omniscient narrator knows the thoughts of one character, while a third-person limited narrator can access all the characters' thoughts.
b. a third-person omniscient narrator shows examples of the author's opinions, while a third-person limited narrator is completely unbiased.
c. a third-person omniscient narrator can see all the characters' actions and know their thoughts, while a third-person limited narrator has insight into only one character.
d. a third-person omniscient narrator uses the pronouns you and yours, while a third-person limited narrator uses the pronouns i and me.