Which of the following is incorrect as it relates to operating income?

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	a. A manufacturing company, operating income includes sales revenue from selling the products it manufactures minus cost of goods sold and operating expenses related to its primary activities.	1
	b. Revenues, expenses, gains, and losses directly related to the primary revenue-generating activities of the company.	0
	c. Operating income includes revenues, expenses, gains, and losses related to peripheral	0
	d. Operating income is often presented as gross profit (sales revenue minus cost of goods sold)	0