What is the output of the following statements? Assume each group is independent. If the result is an empty string, state so.
a. String str = “Hello World!”;
str.substring(6, 10);
b. String str = “Hello World!”;
str.substring(0, 1)
c. String str = “Hello World!”;
System.out.println(str.toLowerCase().getCharAt(0));
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