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	<b>QUESTION 130	
</b></p><hr color="#99CCFF">

<p>You need to modify the STUDENTS table to add a primary key on the STUDENT_ID column. The table is currently empty. 
Which statement accomplishes this task? </p><table border="1" bordercolor="gray" width="665">
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			<p><b><input type="radio" name="AN" value="A">  A.</b></p>
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			<p> ALTER TABLE students <br>ADD PRIMARY KEY student_id; 
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			<p><b><input type="radio" name="AN" value="B">  B.</b></p>
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			<p>   ALTER TABLE students <br>ADD CONSTRAINT PRIMARY KEY (student_id); 
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			<p><b><input type="radio" name="AN" value="C">  C.</b></p>
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			<p>   ALTER TABLE students <br>ADD CONSTRAINT stud_id_pk PRIMARY KEY student_id; 
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			<p><b><input type="radio" name="AN" value="D">  D.</b></p>
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			<p>   ALTER TABLE students <br>ADD CONSTRAINT stud_id_pk PRIMARY KEY (student_id); 
			</p>
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			<p><b><input type="radio" name="AN" value="E">  E.</b></p>
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			<p>   ALTER TABLE students<br>MODIFY CONSTRAINT stud_id_pk PRIMARY KEY (student_id);</p>
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