Which is a valid declarations of a String?

1.	Which is a valid declarations of a String?
A.	String s1 = null;
B.	String s2 = 'null';
C.	String s3 = (String) 'abc';
D.	String s4 = (String) ' ufeed';
Answer» B. String s2 = 'null';

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Which is a valid declarations of a String?

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