Final answer:
Chelsea's father is using the discipline technique of negative punishment by taking away her cell phone and iPod as a consequence for her disrespectful behavior.
Step-by-step explanation:
Chelsea's father is using the discipline technique of negative punishment. Negative punishment involves removing a desired item or activity in order to decrease an undesirable behavior. In this case, Chelsea's father takes away her cell phone and iPod as a consequence for her disrespectful behavior. By removing these items, her father is aiming to decrease the likelihood of Chelsea engaging in disrespectful behavior in the future.