You administer a Microsoft SQL Server 2012 database named Orders. Orders contain a table named OrderShip that is defined

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You administer a Microsoft SQL Server 2012 database named Orders.
Orders contain a table named OrderShip that is defined as follows:

A NULL value represents a domestic order. Ninety percent of the values in CountryCode are NULL.
Customers require a procedure that will return orders for all customers from a specified country. You create a new procedure:

Performance on this procedure is slow.
You need to alter the schema to optimize this query. Objects created must use a minimum amount of resources.
Which Transact-SQL statement should you use?

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A. CREATE NONCLUSTERED INDEX IX_CountryCode ON Ordership (CountryCode) WHERE CountryCode IS NOT NULL
B. CREATE STATISTICS ST_CountryCode ON OrderShip (CountryCode) WHERE CountryCode IS NOT NULL
C. CREATE CLUSTERED INDEX IX_CountryCode ON OrderShip (CountryCode)
D. CREATE INDEX IX_CountryCode ON OrderShip (CustomerID) WHERE CountryCode IS NOT NULL