Many universities provide physical or electronic bulletin boards to facilitate ride-sharing and exchange of used books among students. These bulletin boards increase __________ marketing.

Many universities provide physical or electronic bulletin boards to facilitate ride-sharing and exchange of used books among students. These bulletin boards increase __________ marketing.

Many universities provide physical or electronic bulletin boards to facilitate ride-sharing and exchange of used books among students. These bulletin boards increase __________ marketing.



A.
B2C

B.
C2B

C.
B2B

D.
C2C

E.
underground


Answer: D


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