Taran Company incurred the following costs for the months of January and February.

Type of Cost	January	February
Insurance	$ 5,000	$ 5,000
Utilities	4,000	5,000
Depreciation	3,500	3,500
Materials	10,000	20,000

From the information above we can assume that

	a.	output decreased from January to February.
	b.	insurance is a mixed cost.
	c.	output stayed the same from January to February.
	d.	insurance and depreciation are fixed costs