Final answer:
Strategies to combat parallel imports may involve harmonizing global prices, complicating repair processes for unauthorized imports, and educating consumers on the risks associated with gray market products.
Step-by-step explanation:
A possible strategy to combat parallel imports includes charging similar prices worldwide to minimize the incentive for cross-border shopping. Another strategy is complicating the repair process for parallel imports, making it less attractive for consumers due to potential service issues. Furthermore, informing customers about potential problems with gray market products can deter them from buying these items. Therefore, the correct answer is D. All of the above.