Which option distinguishes why Clarence failed to discover the problem in the following scenario? Clarence is an FDA inspector who works at the seaport in Seattle inspecting fish imports before shipping to grocery stores. He was just notified that a shipment he inspected was identified as containing a foodborne illness.

Inspectors are not qualified to diagnose a foodborne illness.
Inspectors are only required to inspect one fish per box.
Inspectors only examine less than five percent of a shipment.
Inspectors do not have access to bacteria testing on site.