How is voice different from point of view?

a. voice is a personal opinion an author includes in a story, while point of view is the narrator's unbiased view of a story's action.
b. voice is the preexisting knowledge the reader brings to the story, while point of view is the narrator's unbiased view of a story's action.
c. voice is the language an author uses to tell a story, while point of view is the perspective from which a narrator tells a story.
d. voice is the message about life that runs throughout a story, while point of view is the lesson an author wants the reader to learn.