Universal containers (uc) wants to delete data in several fields for 5000 lead records. UC export the selected record IDs and fields that need to have data deleted in a csv file. Which two steps should an app builder suggest to meet these requirements ? Choose 2 answers

Cloud Kicks asked the app builder to insert a list of 25,000 records using deduplication for the Race_Track__c custom object.
Which tool should be used?

Universal Containers is piloting new features in an existing sandbox and wants to prevent outbound email sends during testing.
What should the app builder do to meet the requirement?

Cloud Kicks works on an annual subscription model. When a sales rep marks an opportunity as closed won, a new opportunity should automatically be created for the renewal. The contracts team works outside of Salesforce but also needs to be notified about closed deals in order to initiate the contract process with the customer.
Which automation solution would meet these requirements?

A manager wants to calculate the number of days an account has been last contacted through mail. Which field should be used to achieve this?