ldentify which basic principle of accounting is best described in each item below.

Norfolk Southern Corporation reports revenue in its income statement when the performance obligation is satisfied instead of when the cash is collected.

a$.$

Yahoo! recognizes depreciation expense for a machine over the $2-$year period during which that machine helps the company earn revenue.

b$.$

Oracle Corporation reports information about pending lawsuits in the notes to its financial statements.

Gap, Inc.reports land on its balance sheet at the amount paid to acquire it$,$ even though the estimated fair value is greater.