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Which Presidential Directive placed pipeline security within the jurisdiction of TSA?

  1. PDD 51

  2. PDD 63

  3. PDD 77

  4. PDD 89

The correct answer is: PDD 63

PDD 51, 77, and 89 do not pertain to pipeline security and therefore are incorrect options. PDD 51, also known as the Biological Weapons Defense directive, relates to measures to protect against biological warfare. PDD 77, known as the Environmental Risks directive, focuses on assessing potential risks to the environment. PDD 89, or the Biometrics directive, deals with the collection and use of biometric data for national security purposes. PDD 63, on the other hand, was issued by President Clinton in 1998 and specifically declared that pipeline security falls under the jurisdiction of the Transportation Security Administration (TSA). Therefore, B is the correct answer as it directly relates to the given question.