A function call for a void function named calcEndingInventory() is passed four int variables named beginInventory, sales, purchases, and endingInventory. The functions task is to calculate the ending inventory, using the beginning inventory, sales, and purchase amounts passed to the function. The function should store the result in the endingInventoryvariable. Which of the following function headers is correct?

	a.	void calcEndingInventory (int& b, int& s, int& p, int& e);
	b.	void calcEndingInventory (int b, int s, int p, int& e)
	c.	void calcEndingInventory (int b, int s, int p, int& e);
	d.	void calcEndingInventory (int b, int s, int p, int e)