I firmly believe the author of this question did NOT perform due diligence when selecting possible answers.
The original statement
Check all that apply that are true about
In the case of the master and temp db the question statement should have been: Check all that may apply and are true about
From Books On Line
DBCC CHECKDB
Runs DBCC CHECKALLOC on the database.
Runs DBCC CHECKTABLE on every table and view in the database.
Runs DBCC CHECKCATALOG on the database
From DBCC CHECKALLOC.
http://technet.microsoft.com/en-us/library/aa258809(SQL.80).aspx
Note NOINDEX is maintained for backward compatibility only. All indexes are checked when executing DBCC CHECKALLOC.
So in effect using DBCC CHECKDB which in turn invokes DBCC CHECLALLOC the correct answer is: does check all indexes
On the last possible answer also see:
CHECK STATISTICS
http://connect.microsoft.com/SQLServer/feedback/ViewFeedback.aspx?FeedbackID=158623
(Bold facing entered by myself to drive home my arguement)