Which of the following is not true regarding witness attestation? Question 5 options: a) Witnesses must know they are signing a will, but need not know its contents. b) No particular form of attestation clause is required for will validity, so long as the witnesses sign in their capacity as witnesses to the execution of the will. c) Including a self-proving affidavit is sounds practice in the event of a dispute regarding the will's validity, as it may substitute for live testimony from the witnesses to the will. d) If one of the two witnesses receives a gift under the will, the will is invalid