You are logged into a MacBook Pro as a standard user. How can you display the OS X Mountain Lion build number?

A.
Choose About This Mac from the Apple menu, and then click the text directly under OS X until the build number is revealed.

B.
Type build_number in Spotlight, and then scroll through the resulting information until the build number is revealed.

C.
In the General pane of System Preferences, click the Info disclosure triangle to reveal the build number.

D.
Choose Software Update from the Apple menu, and then choose Build Number from the Update menu.