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What is the correct way to punctuate the sentence?
a. Cody has books, pencils, and crayons in his desk.
b. Cody has books pencils, and crayons in his desk.
c. Cody has books pencils and crayons, in his desk.
d. Cody has books, pencils, and crayons, in his desk.
a. Cody has books, pencils, and crayons in his desk.