Stone Cold, a rock group, assigns its payment under a performance contract to the Artificial Ear, a firm that has supplied the group with instruments and equipment, and to which Stone Cold owes a large sum of money. This assignment is:

Group of answer choices

valid, because this is a simple transfer of the right to receive money.

invalid, because it increases the burden on the payor.

invalid, because Stone Cold has earned the money through personal services.

valid, because of the rule of contract rescission.