Which is the most efficient way to concatenate the two strings, "quick brown fox" and "jumped over the lazy dog" in Java?
A. String string1 = "quick brown fox";
string1 = string1 + " jumped over the lazy dog";
B. String string1 = "quick brown fox";
String string2 = string1 + " jumped over the lazy dog";
C. String string1 = "quick brown fox";
String string2 =" jumped over the lazy dog";
String string3 = string1 + string2;
D. StringBuffer buffer = new StringBuffer("quick brown fox");
buffer.append(" jumped over the lazy dog");
String string1 = buffer.toString();
Answer: D
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