I think the key thing here is the "several web applications" comment in the question. If you write a 'common-logging-filter' you can reuse that easily by adding that to every web-app DD. My answer would be B as well because the others simply don't make sense in this context...
Johan Pelgrim, The Netherlands
SCJP 1.4, SCWCD 1.4, SCBCD 5.0
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