Match this tip with its design consideration. "Use alerts sparingly"

How is the campaign influence for opportunities impacted when a contact is associated to an opportunity in a contact role, if the influence timeframe for a campaign is 60 days?

Cloud Kicks (CK) sells online subscriptions for its leading Shoe of the Month club.
Customers can make a single payment or pay weekly, monthly, or quarterly. CK wants to use Opportunities to track and report on these subscription deals.
What should a consultant recommend to meet this requirement?

Universal Containers ts analyzing data to identify gaps, and wants to know which Accounts with open Opportunities are missing Contacts.
Which feature should a consultant recommend to build this report7

Northern Trail Outfitters wants to link contacts with more than one account.
What solution should be recommended if a contact is an employee in one account, and on the boards of three additional accounts?