If you have a RAID 10 setup with four 500 GB HDDs, how much usable storage capacity will you have?

If you have a RAID 10 setup with four 500 GB HDDs, how much usable storage capacity will you have?

• 1 TB
• 4 TB
• 2 TB
• 1.5 TB 

 EXPLANATION

RAID 10 contains two sets of mirrored drives, and each mirrored set takes two 500 GB drives to store 500 GB of data.
The data will be striped across the two sets for a total of 1 TB usable storage.