A bulletin reads: 'All persons entering secure areas must sign the visitor log with their full name, time of entry, and purpose of visit. Failure to complete all fields invalidates the entry.' A visitor signs her name and notes the time but leaves the purpose field blank. What is the status of her log entry?
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A
Valid, because she provided her name and time
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B
Invalid, because all three fields are required
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C
Valid, because purpose of visit is optional
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D
Invalid only if a supervisor notices the omission