Answer:
The answer is: a. I and II
Step-by-step explanation:
If a company realizes that their products have some defects they should try to make it public and if possible try to recall the defective products. If the products can't be repaired, then they should replace them.
If they try to hide those defective units, eventually their customers will realize something is wrong and things can get ugly for the company. As an example, remember how Volkswagen tried to hide their alterations on diesel engines and it turned into a global scandal costing them billions.