Answer:
1. A. Formal
2. C. Instant message
Step-by-step explanation:
In this scenario, you are running a business and as such the tone of any message to a customer or potential client should always be formal. Since you have a set public policy for the warranty the best communication channel would be Instant Message or E-mail. This way you can provide a copy of your return policy so that the individual understands that you are not obligated to perform any actions since their warranty has already expired.