Which of the following is an example of an APA$-$style reference entry for a book in a references list?

Select one:

a$.$ Smith. John. $(2021).$ The Art of Science. Publisher X$.$

b$.$ The Art of science by John Smith. Publisher X$,2021.$

c$.$ Smith. J$,(2021).$ The Art of Science. Publisher X$.$

a John smith $2021.$ The Art of Science, Publisher X$.$