Universal containers (uc) is implementing a new customer categorization process where customers should be assigned to a gold, silver, or bronze category if they've purchased uc's new support service. customers are expected to be evenly distributed across all three categories. currently, uc has around 500,000 customers, and is expecting 1% of existing non-categorized customers to purchase uc's new support service every month over the next five years. what is the recommended solution to ensure long-term performance, bearing in mind the above requirements?
(a) implement a new picklist custom field in the account object with gold, silver, and bronze values.
(b) implement a new categories custom object and a master-detail relationship from account to category.
(c) implement a new global picklist custom field with gold, silver, and bronze values and enable it in account.
(d) implement a new categories custom object and create a lookup field from account to category.