Under the Uniform Probate Code, when can a court reform a testamentary instrument that has been executed under a mistake of fact? Question 4 options: a) Whenever there is a question as to the testator's probable intent. b) Whenever it is shown by a preponderance of the evidence that reformation is necessary to carry out the testator's intent. c) Whenever it is shown by a clear and convincing evidence that reformation is necessary to carry out the testator's intent. d) Whenever it is shown by a clear and convincing evidence that reformation is necessary to carry out the testator's intent, but only if there is an ambiguity in the instrument