Which type of e-marketplace is called, if it focuses entirely on chemical sector?

Option (4) Vertical is the answer. Thanks.

my answer is option " Four " 

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I agree with Mr.Satish Prbhu answer

I am not sure, but I feel it should be supplier oriented

The answer goes to Supplier Oriented.

My answer will be 4) Vertical Hubs. But not only for chemical, but also applicable for Plastic, steel, paper and telecom.

Supplier-oriented---------------------------------------

2. Supplier-oriented>>>>>>>>>>>>>>>>

Vertical is more suitable for e-marketplace. 

Buyer-oriented==========----------------

This is not Area of ​​my specialization, I hope to invite only specialists in this area