I have a customer with more than 5 million products and 2500 attributes. They are using an external system to push products to specific ecommerce sites. They would like to push 500,000 product to their Magento and these products include 900 attributes. 200 of which are text fields. In additional to enabling flat catalog, which solution can to meet their requirement?
A. Convert the text field attributes to dropdowns or combine to description fields
B. Use Magento websites w aired traffic to specific stores
C. Ask the client to only use 250,000 SKUs along with new attribute sets
D. Convert attributes types to use a custom extension