Which Transact- SQL statement should you use?

You are a database developer of a Microsoft SQL Server 2012 database.
You are designing a table that will store Customer data from different sources. The table will include a column that contains the CustomerID from the source system and a column that contains the SourceID. A sample of this data is as shown in the following table.


You need to ensure that the table has no duplicate CustomerID within a SourceID.
You also need to ensure that the data in the table is in the order of SourceID and then CustomerID.
Which Transact- SQL statement should you use?
A. CREATE TABLE Customer (SourceID int NOT NULL IDENTITY,
CustomerID int NOT NULL IDENTITY, CustomerName varchar(255) NOT NULL);
B. CREATE TABLE Customer (SourceID int NOT NULL,
CustomerID int NOT NULL PRIMARY KEY CLUSTERED,
CustomerName varchar(255) NOT NULL);
C. CREATE TABLE Customer
(SourceID int NOT NULL PRIMARY KEY CLUSTERED,
CustomerID int NOT NULL UNIQUE, CustomerName varchar(255) NOT NULL);
D. CREATE TABLE Customer (SourceID int NOT NULL, CustomerID int NOT NULL,
CustomerName varchar(255) NOT NULL,
CONSTRAINT PK_Customer PRIMARY KEY CLUSTERED
(SourceID, CustomerID));

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