In regard to DynamoDB, which of the following statements is correct?

A.
An Item should have at least two value sets, a primary key and another attribute.

B.
An Item can have more than one attributes.

C.
A primary key should be single-valued.

D.
An attribute can have one or several other attributes.

Explanation:
In Amazon DynamoDB, a database is a collection of tables. A table is a collection of items and each item is a collection
of attributes.
http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/DataModel.html