How many String objects are instantiated by the following code segment (not including the literals)?
```
String s1, output;
s1 = "hello";
output = "\nThe string reversed is: " ;
for (int i = s1.length() - 1; i >= 0; i--)
output += s1.charAt(i) + " " ;
```
a. 1.
b. 4.
c. 5.
d. 7.
d. 7.
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