That these goals can be modified, but must result from a person's voluntary on both sides only. This is an opportunity which all happen always, and sometimes we just have to be a decision to modify.
These targets can be modified, but must result from the willingness of the two parties only. All of which has not always happen and sometimes we just have to decide to change.
Which these goals can be adjusted, but due to the willingness of people on both sides. All of which is likely to happen, and sometimes we have to decide to adjust the change.