Which of the following creates the string of the numbers from 1 to 1000 most efficiently?
a.
```
String s;
for (int i = 1; i <= 1000; i++)
s += i;
```
b.
```
StringBuilder sb = new StringBuilder(10);
for (int i = 1; i <= 1000; i++)
sb.append(i);
String s = new String(sb);
```
c.
```
StringBuilder sb = new StringBuilder(3000);
for (int i = 1; i <= 1000; i++)
sb.append(i);
String s = new String(sb);
```
d. All are equivalently efficient.
c.
```
StringBuilder sb = new StringBuilder(3000);
for (int i = 1; i <= 1000; i++)
sb.append(i);
String s = new String(sb);
```
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