Which of these is a true statement concerning the Value Added Tax (VAT)?

A. European Union countries have adopted a single uniform rate for the VAT.

B. The VAT is imposed on the sellers of products and services.

C. Value added equals the difference between the price at which the product or service is sold and the non-labor costs of producing it.

D. Countries that impose a VAT do not also assess an income tax on business operations.

Please support your choice with reasonable rationale. Looking forward to your responses!