In QuickBooks Online, what is the difference between a service item and a non-inventory item?

a. A service item is used to track income or expenses related to research and development, while a non-inventory item is used to track income or expenses related to advertising and marketing.
b. A service item is used to track income or expenses related to products that the company stocks or resells, while a non-inventory item is used to track income or expenses related to services provided.
c. A service item is used to track income or expenses related to fixed assets, while a non-inventory item is used to track income or expenses related to intangible assets.
d. A service item is used to track income or expenses related to services provided, while a non-inventory item is used to track income or expenses related to products that the company does not stock or resell.