A Forum Selection Clause

A forum selection clause:

A) is written into a contract when the contract is entered into.
B) is created by the contracting parties after the dispute arises after they analyze the fairest location for the trial.
C) is created by the court after determining where jurisdiction is the strongest.
D) is created by the parties after the dispute arises based on the type of dispute and which state's court has the appropriate precedent and statutory law to hear the case