Invoicing for supplies to third party exporter

Dear Sirs,

Manufacturer-cum-supplier is in state A, Exporter's too, is located in state A, but the goods(Granite Blocks) are moving to Shipping Agents Yard, at sea port, in State B. Buyer is registered in state A only. 

Kindly guide-

(1)whether applicable GST will be CGST+SGST  or IGST ?

(2) If IGST, whether this invoice will be marked as "Supplies meant for Export with/without payment of IGST" if the exporter has Deposited Bond/LUT with Official?

Regards