Presented below are three economic events. On a sheet of paper, list the letters (a), (b), an (c) with columns for assets, liabilities, and stockholders' equity. In each column, indicate whether the event increased (+), decreased (-), or had no effect (NE) on assets, liabilities, and stockholders' equity.

(a) Purchased supplies on account.

(b) Received cash for providing a service.

(c) Expenses paid in cash.