By default, indexes are stored in the ______ filegroup as the

By default, indexes are stored in the ______ filegroup as the base table on which the index is created.

A. same

B. different

C. may be same or different

D. none of the mentioned

I got this question in class test.

I need to ask this question from Indexing Strategies topic in chapter Performance Tuning and Optimization of SQL Server

Right choice is A. same

The explanation: A nonpartitioned clustered index and the base table always reside in the same filegroup.