What are the three stages of smart tourism in 21st century？

A.Pre-Experience-Digital Innovation Platform

B.Experience-SOLOMO - FinTech

C.Post-Experience-Cross Border e-Commerce O2O

D.Post-Experience-Cross Border e-Commerce F2F

正确答案：Pre-Experience-Digital Innovation Platform；Experience-SOLOMO - FinTech；Post-Experience-Cross Border e-Commerce O2O