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What will be the output of the program? String d = "bookkeeper"; d.substring(1,7); d = "w" + d; d.append("woo"); /* Line 4 */ System.out.println(d);

wookkeewoo
wbookkeeper
wbookkeewoo
Compilation fails.

Correct Answer: Compilation fails.

Explanation:

In line 4 the code calls a StringBuffer method, append() on a String object.

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