The [:alpha:] in the expression indicates:
```
preg_match("/\b(car[[:alpha:]]+)\b/i", $string)
```
a. searches for any word beginning with the pattern "car"
b. searches for any word ending with the pattern "car"
c. searches specifically for the whole word "car"
d. searches for any lowercase string that matches the pattern "car"
a. searches for any word beginning with the pattern "car"
Computer Science & Information Technology
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