How can a developer prevent IBM Bluemix from logging data in an API request to an IBM Watson service?

How can a developer prevent IBM Bluemix from logging data in an API request to an IBM Watson service?
A . Set a header parameter called X-Stop-Training-Watson to true in the HTTP request.
B . Disable training from in the IBM Bluemix dashboard.
C . Pass a parameter called DisableTraining=false in the API request.
D . Set a header parameter called X-Watson-Learning-Opt-Out with the value true in the HTTP request.

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Answer: D