is the oldest and fastest-growing form of e-commerce, which allows e-business to collaborate, partner, and share research and complex data with other businesses.

is the oldest and fastest-growing form of e-commerce, which allows e-business to collaborate, partner, and share research and complex data with other businesses.
A.B2B
B.C2C
C.B2C
D.C2B
正确答案：B2B