For the String line1 to have 4 tokens, delimArg should be:
```
String line1 = new String("c = 1 + 2 + 3") ;
StringTokenizer tok = new StringTokenizer(line1, delimArg);
```
a. String delimArg = "+=";
b. String delimArg = "123"
c. String delimArg = "c+";
d. String delimArg = " ";
a. String delimArg = "+=";
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