In Strategic Alliance or Partnership Type of Business Relationships the Negotiation

In strategic alliance or partnership type of business relationships the negotiation stage:

A) can extend over weeks,months or even years.
B) can become very awkward for the seller.
C) is very short,that is,resolved in a day or two.
D) does not arise because the buyer and seller are always on the same page.
E) needs third-party mediators to handle this delicate process so that neither party is offended.