【单选题】As to the international business negotiation for both the machine and the relevant technology, the best negotiation method is ( ).
A.
To establish only one negotiation group and let the group to negotiate both the machine and the relevant technology and conclude two pieces of contract which include the machine and the relevant technology respectively
B.
To establish only one negotiation group and let the group to negotiate both the machine and the relevant technology and conclude a piece of contract which includes both commodities
C.
To establish two negotiation groups and let these two groups to negotiate the machine and the relevant technology respectively, however, in the end they conclude only a piece of contract which includes both commodities
D.
To establish two negotiation groups and let these two groups to negotiate the machine and the relevant technology respectively and conclude two pieces of contract which include both commodities respectively