During a traffic stop, why is it advisable not to talk on a cell phone while interacting with the officer?

• To avoid distractions and ensure clear communication
  Explanation:

  "Do not talk on a cell phone while interacting with the officer during the stop. The officer has to be able to give you and your passengers detailed instructions so you will understand what is expected of you. If you receive a telephone call during the traffic stop, the officer will tell you whether or not you may answer the telephone call."
• To interfere with the officer's radio communications
• To maintain privacy and prevent the officer from overhearing personal conversations
• None of the above