What Is the Purpose of a "Choice of Forum" Clause

What is the purpose of a "choice of forum" clause in an international contract?

A) to give the parties a choice of nations in which to bring a lawsuit under the contract
B) to determine in advance where any lawsuit arising from the contract will be brought
C) to determine who will choose the location where any lawsuit arising from the contract will be brought
D) to determine which nation's law will apply in settling disputes that arise under the contract
E) to limit the plaintiff's choice of remedy