A systems engineer is reviewing output from a web application vulnerability scan. The engineer has determined data is entering the application from an untrusted source and is being used to construct a query dynamically. Which of the following code snippets would BEST protect the application against a SQL injection attack? A. String input = request.getParameter (SegNo); String characterPattern = [0-9a-zA-2] If (! Input. Matches (characterPattern)) out.println (Invalid Input); B. /> C. catch (Exception e) if (log.isDebugEnabled ()) log.debug (context, EVENTS.ADHOC, CaughtInvalidGSMException Exception - + e.tostring ()); D. PLEASE PROVIDE AN EXPLANATION TO THE CORRECT ANSWER AS WELL AS WHY THE OTHER ANSWERS ARE NOT CORRECT FOR A THUMBS UP - thank you!