In regard to DynamoDB, what is the Global secondary index?

A.
An index with a hash and range key that can be different from those on the table

B.
An index that has the same range key as the table, but a different hash key

C.
An index that has the same hash key and range key as the table

D.
An index that has the same hash key as the table, but a different range key

Explanation:
Global secondary index — an index with a hash and range key that can be different from those on the table.
http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/DataModel.html