Explanation
To set up a rebate type that is valid for transactions completed in January, the admin at Badger Power needs to use the eligibility criteria feature on the rebate type. Eligibility criteria are rules that define which transactions qualify for a rebate type. The admin can use the activity date field on the transaction object to specify the date range for the rebate type. For example, the admin can create a rule that says activity date is greater than or equal to January 1 and less than or equal to January 31. This way, only the transactions that occurred in January will be eligible for the rebate type. The other options are not correct, as they either involve creating a new rebate program, which is unnecessary,or using the effective date or active status fields on the rebate type, which do not control the transaction eligibility. References: [Create Rebate Types], [Set Up Eligibility Criteria for Rebate Types], [Rebate Type Fields]