C .
To satisfy this requirement, the administrator should create a queue for all new cases related to the new product. Then, they should create a criteria-based sharing rule that gives read/write access to the queue for the two lead engineers. This will ensure that all new cases related to the new product are automatically assigned to the queue, and the lead engineers will have the necessary access to work on them.

Option A (create an auto-response rule and a public group) is not relevant to the requirement of giving access to the lead engineers. An auto-response rule only sends an email response to the customer who submitted the case, and a public group does not provide the necessary access.

Option B (create a predefined case team and an assignment rule) is also not necessary. Predefined case teams are used when a group of people needs access to a case, but the lead engineers can be given access directly through sharing rules.

Option D (create a user-based sharing rule and an ad-hoc case team) is not necessary because it involves creating an additional case team, which is not required for this scenario. A criteria-based sharing rule can be used to provide the necessary access to the lead engineers....