A. Tourists go directly to the tax refund counter for a refund without needing a customs stamp after shopping

B. Tourists do not request a tax refund form while shopping and apply for a refund after returning home

C. Tourists promptly request a tax refund form after shopping, go to customs for a stamp before leaving the country, then proceed to the tax refund counter to process the refund, while paying attention to the validity period specified on the tax refund form

D. After getting the customs stamp, tourists casually discard the tax refund form and go directly to the tax refund counter